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Finding the Fourth Proportional to 66.61, 91.85 and 42.02

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Solution

The fourth proportional to 66.61, 91.85 and 42.02 is: 57.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.61 : 91.85 = 42.02 : x
  2. Step 2: Convert to fraction form
    66.61/91.85 = 42.02/x
  3. Step 3: Cross multiply
    66.61x = 91.85 × 42.02
  4. Step 4: Simplify right side
    66.61x = 3,858.87
  5. Step 5: Solve for x
    x = 3,858.87/66.61
  6. Step 6: Final answer
    x = 57.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.