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Finding the Fourth Proportional to 239.20, 358.68 and 90.91

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Solution

The fourth proportional to 239.20, 358.68 and 90.91 is: 136.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.20 : 358.68 = 90.91 : x
  2. Step 2: Convert to fraction form
    239.20/358.68 = 90.91/x
  3. Step 3: Cross multiply
    239.20x = 358.68 × 90.91
  4. Step 4: Simplify right side
    239.20x = 32,607.60
  5. Step 5: Solve for x
    x = 32,607.60/239.20
  6. Step 6: Final answer
    x = 136.32

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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.