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Finding the Fourth Proportional to 92.79, 128.12 and 66.87

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Solution

The fourth proportional to 92.79, 128.12 and 66.87 is: 92.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.79 : 128.12 = 66.87 : x
  2. Step 2: Convert to fraction form
    92.79/128.12 = 66.87/x
  3. Step 3: Cross multiply
    92.79x = 128.12 × 66.87
  4. Step 4: Simplify right side
    92.79x = 8,567.38
  5. Step 5: Solve for x
    x = 8,567.38/92.79
  6. Step 6: Final answer
    x = 92.33

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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.