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Finding the Fourth Proportional to 291.79, 437.71 and 86.35

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Solution

The fourth proportional to 291.79, 437.71 and 86.35 is: 129.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.79 : 437.71 = 86.35 : x
  2. Step 2: Convert to fraction form
    291.79/437.71 = 86.35/x
  3. Step 3: Cross multiply
    291.79x = 437.71 × 86.35
  4. Step 4: Simplify right side
    291.79x = 37,798.30
  5. Step 5: Solve for x
    x = 37,798.30/291.79
  6. Step 6: Final answer
    x = 129.54

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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.