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Finding the Fourth Proportional to 639.63, 959.72 and 614.79

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Solution

The fourth proportional to 639.63, 959.72 and 614.79 is: 922.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.63 : 959.72 = 614.79 : x
  2. Step 2: Convert to fraction form
    639.63/959.72 = 614.79/x
  3. Step 3: Cross multiply
    639.63x = 959.72 × 614.79
  4. Step 4: Simplify right side
    639.63x = 590,023.18
  5. Step 5: Solve for x
    x = 590,023.18/639.63
  6. Step 6: Final answer
    x = 922.44

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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.