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Finding the Fourth Proportional to 102.12, 140.17 and 90.60

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Solution

The fourth proportional to 102.12, 140.17 and 90.60 is: 124.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.12 : 140.17 = 90.60 : x
  2. Step 2: Convert to fraction form
    102.12/140.17 = 90.60/x
  3. Step 3: Cross multiply
    102.12x = 140.17 × 90.60
  4. Step 4: Simplify right side
    102.12x = 12,699.40
  5. Step 5: Solve for x
    x = 12,699.40/102.12
  6. Step 6: Final answer
    x = 124.36

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.