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Finding the Fourth Proportional to 66.89, 92.32 and 42.35

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Solution

The fourth proportional to 66.89, 92.32 and 42.35 is: 58.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.89 : 92.32 = 42.35 : x
  2. Step 2: Convert to fraction form
    66.89/92.32 = 42.35/x
  3. Step 3: Cross multiply
    66.89x = 92.32 × 42.35
  4. Step 4: Simplify right side
    66.89x = 3,909.75
  5. Step 5: Solve for x
    x = 3,909.75/66.89
  6. Step 6: Final answer
    x = 58.45

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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.