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Finding the Fourth Proportional to 66.76, 100.18 and 53

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Solution

The fourth proportional to 66.76, 100.18 and 53 is: 79.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.76 : 100.18 = 53 : x
  2. Step 2: Convert to fraction form
    66.76/100.18 = 53/x
  3. Step 3: Cross multiply
    66.76x = 100.18 × 53
  4. Step 4: Simplify right side
    66.76x = 5,309.54
  5. Step 5: Solve for x
    x = 5,309.54/66.76
  6. Step 6: Final answer
    x = 79.53

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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.