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Finding the Fourth Proportional to 124.20, 186.18 and 90.15

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Solution

The fourth proportional to 124.20, 186.18 and 90.15 is: 135.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.20 : 186.18 = 90.15 : x
  2. Step 2: Convert to fraction form
    124.20/186.18 = 90.15/x
  3. Step 3: Cross multiply
    124.20x = 186.18 × 90.15
  4. Step 4: Simplify right side
    124.20x = 16,784.13
  5. Step 5: Solve for x
    x = 16,784.13/124.20
  6. Step 6: Final answer
    x = 135.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.