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Finding the Fourth Proportional to 715,904,676.66, 987,834,623.66 and 402,578,380.78

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Solution

The fourth proportional to 715,904,676.66, 987,834,623.66 and 402,578,380.78 is: 555,494,154.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,904,676.66 : 987,834,623.66 = 402,578,380.78 : x
  2. Step 2: Convert to fraction form
    715,904,676.66/987,834,623.66 = 402,578,380.78/x
  3. Step 3: Cross multiply
    715,904,676.66x = 987,834,623.66 × 402,578,380.78
  4. Step 4: Simplify right side
    715,904,676.66x = 397,680,863,272,894,912
  5. Step 5: Solve for x
    x = 397,680,863,272,894,912/715,904,676.66
  6. Step 6: Final answer
    x = 555,494,154.79

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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.