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Finding the Fourth Proportional to 66.72, 99.98 and 40.98

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Solution

The fourth proportional to 66.72, 99.98 and 40.98 is: 61.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.72 : 99.98 = 40.98 : x
  2. Step 2: Convert to fraction form
    66.72/99.98 = 40.98/x
  3. Step 3: Cross multiply
    66.72x = 99.98 × 40.98
  4. Step 4: Simplify right side
    66.72x = 4,097.18
  5. Step 5: Solve for x
    x = 4,097.18/66.72
  6. Step 6: Final answer
    x = 61.41

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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.