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Finding the Fourth Proportional to 92.98, 129.15 and 90.42

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Solution

The fourth proportional to 92.98, 129.15 and 90.42 is: 125.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.98 : 129.15 = 90.42 : x
  2. Step 2: Convert to fraction form
    92.98/129.15 = 90.42/x
  3. Step 3: Cross multiply
    92.98x = 129.15 × 90.42
  4. Step 4: Simplify right side
    92.98x = 11,677.74
  5. Step 5: Solve for x
    x = 11,677.74/92.98
  6. Step 6: Final answer
    x = 125.59

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.