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Finding the Fourth Proportional to 291.50, 437.29 and 129.17

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Solution

The fourth proportional to 291.50, 437.29 and 129.17 is: 193.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.50 : 437.29 = 129.17 : x
  2. Step 2: Convert to fraction form
    291.50/437.29 = 129.17/x
  3. Step 3: Cross multiply
    291.50x = 437.29 × 129.17
  4. Step 4: Simplify right side
    291.50x = 56,484.75
  5. Step 5: Solve for x
    x = 56,484.75/291.50
  6. Step 6: Final answer
    x = 193.78

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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.