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Finding the Fourth Proportional to 66.47, 99.71 and 18.38

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Solution

The fourth proportional to 66.47, 99.71 and 18.38 is: 27.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.47 : 99.71 = 18.38 : x
  2. Step 2: Convert to fraction form
    66.47/99.71 = 18.38/x
  3. Step 3: Cross multiply
    66.47x = 99.71 × 18.38
  4. Step 4: Simplify right side
    66.47x = 1,832.67
  5. Step 5: Solve for x
    x = 1,832.67/66.47
  6. Step 6: Final answer
    x = 27.57

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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.