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Finding the Fourth Proportional to 715,977,908.88, 988,042,375.59 and 398,432,715.73

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Solution

The fourth proportional to 715,977,908.88, 988,042,375.59 and 398,432,715.73 is: 549,833,175.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,977,908.88 : 988,042,375.59 = 398,432,715.73 : x
  2. Step 2: Convert to fraction form
    715,977,908.88/988,042,375.59 = 398,432,715.73/x
  3. Step 3: Cross multiply
    715,977,908.88x = 988,042,375.59 × 398,432,715.73
  4. Step 4: Simplify right side
    715,977,908.88x = 393,668,406,962,644,416
  5. Step 5: Solve for x
    x = 393,668,406,962,644,416/715,977,908.88
  6. Step 6: Final answer
    x = 549,833,175.13

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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.