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Finding the Fourth Proportional to 487,686.54, 731,455.90 and 132,728.22

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Solution

The fourth proportional to 487,686.54, 731,455.90 and 132,728.22 is: 199,072.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,686.54 : 731,455.90 = 132,728.22 : x
  2. Step 2: Convert to fraction form
    487,686.54/731,455.90 = 132,728.22/x
  3. Step 3: Cross multiply
    487,686.54x = 731,455.90 × 132,728.22
  4. Step 4: Simplify right side
    487,686.54x = 97,084,839,615.50
  5. Step 5: Solve for x
    x = 97,084,839,615.50/487,686.54
  6. Step 6: Final answer
    x = 199,072.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.