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Finding the Fourth Proportional to 66.01, 91.19 and 58.69

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Solution

The fourth proportional to 66.01, 91.19 and 58.69 is: 81.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.01 : 91.19 = 58.69 : x
  2. Step 2: Convert to fraction form
    66.01/91.19 = 58.69/x
  3. Step 3: Cross multiply
    66.01x = 91.19 × 58.69
  4. Step 4: Simplify right side
    66.01x = 5,351.65
  5. Step 5: Solve for x
    x = 5,351.65/66.01
  6. Step 6: Final answer
    x = 81.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.