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Finding the Fourth Proportional to 655.20, 987.54 and 625.92

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Solution

The fourth proportional to 655.20, 987.54 and 625.92 is: 943.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.20 : 987.54 = 625.92 : x
  2. Step 2: Convert to fraction form
    655.20/987.54 = 625.92/x
  3. Step 3: Cross multiply
    655.20x = 987.54 × 625.92
  4. Step 4: Simplify right side
    655.20x = 618,121.04
  5. Step 5: Solve for x
    x = 618,121.04/655.20
  6. Step 6: Final answer
    x = 943.41

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.