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Finding the Fourth Proportional to 617.31, 926.78 and 434.79

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Solution

The fourth proportional to 617.31, 926.78 and 434.79 is: 652.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.31 : 926.78 = 434.79 : x
  2. Step 2: Convert to fraction form
    617.31/926.78 = 434.79/x
  3. Step 3: Cross multiply
    617.31x = 926.78 × 434.79
  4. Step 4: Simplify right side
    617.31x = 402,954.68
  5. Step 5: Solve for x
    x = 402,954.68/617.31
  6. Step 6: Final answer
    x = 652.76

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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.