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Finding the Fourth Proportional to 715,396,404.80, 987,351,586.08 and 402,156,418.88

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Solution

The fourth proportional to 715,396,404.80, 987,351,586.08 and 402,156,418.88 is: 555,034,628.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,396,404.80 : 987,351,586.08 = 402,156,418.88 : x
  2. Step 2: Convert to fraction form
    715,396,404.80/987,351,586.08 = 402,156,418.88/x
  3. Step 3: Cross multiply
    715,396,404.80x = 987,351,586.08 × 402,156,418.88
  4. Step 4: Simplify right side
    715,396,404.80x = 397,069,778,033,420,864
  5. Step 5: Solve for x
    x = 397,069,778,033,420,864/715,396,404.80
  6. Step 6: Final answer
    x = 555,034,628.87

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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.