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Finding the Fourth Proportional to 642,171.38, 886,196.48 and 355,709.92

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Solution

The fourth proportional to 642,171.38, 886,196.48 and 355,709.92 is: 490,879.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,171.38 : 886,196.48 = 355,709.92 : x
  2. Step 2: Convert to fraction form
    642,171.38/886,196.48 = 355,709.92/x
  3. Step 3: Cross multiply
    642,171.38x = 886,196.48 × 355,709.92
  4. Step 4: Simplify right side
    642,171.38x = 315,228,879,005.08
  5. Step 5: Solve for x
    x = 315,228,879,005.08/642,171.38
  6. Step 6: Final answer
    x = 490,879.68

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Double scale
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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.