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Finding the Fourth Proportional to 124.20, 187.20 and 122.40

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Solution

The fourth proportional to 124.20, 187.20 and 122.40 is: 184.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.20 : 187.20 = 122.40 : x
  2. Step 2: Convert to fraction form
    124.20/187.20 = 122.40/x
  3. Step 3: Cross multiply
    124.20x = 187.20 × 122.40
  4. Step 4: Simplify right side
    124.20x = 22,913.28
  5. Step 5: Solve for x
    x = 22,913.28/124.20
  6. Step 6: Final answer
    x = 184.49

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.