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Finding the Fourth Proportional to 66.51, 99.72 and 42.57

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Solution

The fourth proportional to 66.51, 99.72 and 42.57 is: 63.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.51 : 99.72 = 42.57 : x
  2. Step 2: Convert to fraction form
    66.51/99.72 = 42.57/x
  3. Step 3: Cross multiply
    66.51x = 99.72 × 42.57
  4. Step 4: Simplify right side
    66.51x = 4,245.08
  5. Step 5: Solve for x
    x = 4,245.08/66.51
  6. Step 6: Final answer
    x = 63.83

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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.