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Finding the Fourth Proportional to 625.79, 939.60 and 261.29

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Solution

The fourth proportional to 625.79, 939.60 and 261.29 is: 392.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.79 : 939.60 = 261.29 : x
  2. Step 2: Convert to fraction form
    625.79/939.60 = 261.29/x
  3. Step 3: Cross multiply
    625.79x = 939.60 × 261.29
  4. Step 4: Simplify right side
    625.79x = 245,510.43
  5. Step 5: Solve for x
    x = 245,510.43/625.79
  6. Step 6: Final answer
    x = 392.32

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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.