Home / 642,140.80-886,749.96-480,715.60

Finding the Fourth Proportional to 642,140.80, 886,749.96 and 480,715.60

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Solution

The fourth proportional to 642,140.80, 886,749.96 and 480,715.60 is: 663,833.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,140.80 : 886,749.96 = 480,715.60 : x
  2. Step 2: Convert to fraction form
    642,140.80/886,749.96 = 480,715.60/x
  3. Step 3: Cross multiply
    642,140.80x = 886,749.96 × 480,715.60
  4. Step 4: Simplify right side
    642,140.80x = 426,274,539,071.38
  5. Step 5: Solve for x
    x = 426,274,539,071.38/642,140.80
  6. Step 6: Final answer
    x = 663,833.44

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.