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Finding the Fourth Proportional to 721,644.31, 995,871.79 and 390,500.25

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Solution

The fourth proportional to 721,644.31, 995,871.79 and 390,500.25 is: 538,891.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,644.31 : 995,871.79 = 390,500.25 : x
  2. Step 2: Convert to fraction form
    721,644.31/995,871.79 = 390,500.25/x
  3. Step 3: Cross multiply
    721,644.31x = 995,871.79 × 390,500.25
  4. Step 4: Simplify right side
    721,644.31x = 388,888,182,962.95
  5. Step 5: Solve for x
    x = 388,888,182,962.95/721,644.31
  6. Step 6: Final answer
    x = 538,891.77

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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.