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Finding the Fourth Proportional to 91.28, 136.83 and 58.69

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Solution

The fourth proportional to 91.28, 136.83 and 58.69 is: 87.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.28 : 136.83 = 58.69 : x
  2. Step 2: Convert to fraction form
    91.28/136.83 = 58.69/x
  3. Step 3: Cross multiply
    91.28x = 136.83 × 58.69
  4. Step 4: Simplify right side
    91.28x = 8,030.06
  5. Step 5: Solve for x
    x = 8,030.06/91.28
  6. Step 6: Final answer
    x = 87.97

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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.