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Finding the Fourth Proportional to 717,908,611.96, 990,711,893.42 and 400,369,157.12

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Solution

The fourth proportional to 717,908,611.96, 990,711,893.42 and 400,369,157.12 is: 552,508,326.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,908,611.96 : 990,711,893.42 = 400,369,157.12 : x
  2. Step 2: Convert to fraction form
    717,908,611.96/990,711,893.42 = 400,369,157.12/x
  3. Step 3: Cross multiply
    717,908,611.96x = 990,711,893.42 × 400,369,157.12
  4. Step 4: Simplify right side
    717,908,611.96x = 396,650,485,717,773,376
  5. Step 5: Solve for x
    x = 396,650,485,717,773,376/717,908,611.96
  6. Step 6: Final answer
    x = 552,508,326.42

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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.