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Finding the Fourth Proportional to 642,324.87, 886,336.80 and 355,773.20

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Solution

The fourth proportional to 642,324.87, 886,336.80 and 355,773.20 is: 490,927.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,324.87 : 886,336.80 = 355,773.20 : x
  2. Step 2: Convert to fraction form
    642,324.87/886,336.80 = 355,773.20/x
  3. Step 3: Cross multiply
    642,324.87x = 886,336.80 × 355,773.20
  4. Step 4: Simplify right side
    642,324.87x = 315,334,875,182.08
  5. Step 5: Solve for x
    x = 315,334,875,182.08/642,324.87
  6. Step 6: Final answer
    x = 490,927.40

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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.