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Finding the Fourth Proportional to 291.79, 437.57 and 86.29

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Solution

The fourth proportional to 291.79, 437.57 and 86.29 is: 129.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.79 : 437.57 = 86.29 : x
  2. Step 2: Convert to fraction form
    291.79/437.57 = 86.29/x
  3. Step 3: Cross multiply
    291.79x = 437.57 × 86.29
  4. Step 4: Simplify right side
    291.79x = 37,757.92
  5. Step 5: Solve for x
    x = 37,757.92/291.79
  6. Step 6: Final answer
    x = 129.40

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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.