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Finding the Fourth Proportional to 102.88, 141.81 and 90.58

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Solution

The fourth proportional to 102.88, 141.81 and 90.58 is: 124.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.88 : 141.81 = 90.58 : x
  2. Step 2: Convert to fraction form
    102.88/141.81 = 90.58/x
  3. Step 3: Cross multiply
    102.88x = 141.81 × 90.58
  4. Step 4: Simplify right side
    102.88x = 12,845.15
  5. Step 5: Solve for x
    x = 12,845.15/102.88
  6. Step 6: Final answer
    x = 124.86

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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.