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Finding the Fourth Proportional to 291.61, 437.49 and 86.19

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Solution

The fourth proportional to 291.61, 437.49 and 86.19 is: 129.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.61 : 437.49 = 86.19 : x
  2. Step 2: Convert to fraction form
    291.61/437.49 = 86.19/x
  3. Step 3: Cross multiply
    291.61x = 437.49 × 86.19
  4. Step 4: Simplify right side
    291.61x = 37,707.26
  5. Step 5: Solve for x
    x = 37,707.26/291.61
  6. Step 6: Final answer
    x = 129.31

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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.