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Finding the Fourth Proportional to 717,989.97, 991,079.91 and 641,376.01

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Solution

The fourth proportional to 717,989.97, 991,079.91 and 641,376.01 is: 885,325.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,989.97 : 991,079.91 = 641,376.01 : x
  2. Step 2: Convert to fraction form
    717,989.97/991,079.91 = 641,376.01/x
  3. Step 3: Cross multiply
    717,989.97x = 991,079.91 × 641,376.01
  4. Step 4: Simplify right side
    717,989.97x = 635,654,878,266.96
  5. Step 5: Solve for x
    x = 635,654,878,266.96/717,989.97
  6. Step 6: Final answer
    x = 885,325.57

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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.