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Finding the Fourth Proportional to 66.90, 99.81 and 58.23

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Solution

The fourth proportional to 66.90, 99.81 and 58.23 is: 86.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.90 : 99.81 = 58.23 : x
  2. Step 2: Convert to fraction form
    66.90/99.81 = 58.23/x
  3. Step 3: Cross multiply
    66.90x = 99.81 × 58.23
  4. Step 4: Simplify right side
    66.90x = 5,811.94
  5. Step 5: Solve for x
    x = 5,811.94/66.90
  6. Step 6: Final answer
    x = 86.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.