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Finding the Fourth Proportional to 721,655.34, 995,886.96 and 390,511.26

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Solution

The fourth proportional to 721,655.34, 995,886.96 and 390,511.26 is: 538,906.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,655.34 : 995,886.96 = 390,511.26 : x
  2. Step 2: Convert to fraction form
    721,655.34/995,886.96 = 390,511.26/x
  3. Step 3: Cross multiply
    721,655.34x = 995,886.96 × 390,511.26
  4. Step 4: Simplify right side
    721,655.34x = 388,905,071,567.17
  5. Step 5: Solve for x
    x = 388,905,071,567.17/721,655.34
  6. Step 6: Final answer
    x = 538,906.94

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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.