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Finding the Fourth Proportional to 66.63, 99.87 and 32.40

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Solution

The fourth proportional to 66.63, 99.87 and 32.40 is: 48.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.63 : 99.87 = 32.40 : x
  2. Step 2: Convert to fraction form
    66.63/99.87 = 32.40/x
  3. Step 3: Cross multiply
    66.63x = 99.87 × 32.40
  4. Step 4: Simplify right side
    66.63x = 3,235.79
  5. Step 5: Solve for x
    x = 3,235.79/66.63
  6. Step 6: Final answer
    x = 48.56

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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.