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Finding the Fourth Proportional to 66.88, 99.79 and 59.53

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Solution

The fourth proportional to 66.88, 99.79 and 59.53 is: 88.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.88 : 99.79 = 59.53 : x
  2. Step 2: Convert to fraction form
    66.88/99.79 = 59.53/x
  3. Step 3: Cross multiply
    66.88x = 99.79 × 59.53
  4. Step 4: Simplify right side
    66.88x = 5,940.50
  5. Step 5: Solve for x
    x = 5,940.50/66.88
  6. Step 6: Final answer
    x = 88.82

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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.