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Finding the Fourth Proportional to 721,797,115.64, 996,053,347.51 and 391,765,168.76

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Solution

The fourth proportional to 721,797,115.64, 996,053,347.51 and 391,765,168.76 is: 540,621,456.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,797,115.64 : 996,053,347.51 = 391,765,168.76 : x
  2. Step 2: Convert to fraction form
    721,797,115.64/996,053,347.51 = 391,765,168.76/x
  3. Step 3: Cross multiply
    721,797,115.64x = 996,053,347.51 × 391,765,168.76
  4. Step 4: Simplify right side
    721,797,115.64x = 390,219,007,775,258,432
  5. Step 5: Solve for x
    x = 390,219,007,775,258,432/721,797,115.64
  6. Step 6: Final answer
    x = 540,621,456.26

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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.