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Finding the Fourth Proportional to 721,648.32, 995,877.32 and 390,504.26

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Solution

The fourth proportional to 721,648.32, 995,877.32 and 390,504.26 is: 538,897.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,648.32 : 995,877.32 = 390,504.26 : x
  2. Step 2: Convert to fraction form
    721,648.32/995,877.32 = 390,504.26/x
  3. Step 3: Cross multiply
    721,648.32x = 995,877.32 × 390,504.26
  4. Step 4: Simplify right side
    721,648.32x = 388,894,335,897.38
  5. Step 5: Solve for x
    x = 388,894,335,897.38/721,648.32
  6. Step 6: Final answer
    x = 538,897.31

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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.