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Finding the Fourth Proportional to 102.84, 141.60 and 90.56

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Solution

The fourth proportional to 102.84, 141.60 and 90.56 is: 124.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.84 : 141.60 = 90.56 : x
  2. Step 2: Convert to fraction form
    102.84/141.60 = 90.56/x
  3. Step 3: Cross multiply
    102.84x = 141.60 × 90.56
  4. Step 4: Simplify right side
    102.84x = 12,823.30
  5. Step 5: Solve for x
    x = 12,823.30/102.84
  6. Step 6: Final answer
    x = 124.69

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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.