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Finding the Fourth Proportional to 124.88, 187.04 and 81.50

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Solution

The fourth proportional to 124.88, 187.04 and 81.50 is: 122.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.88 : 187.04 = 81.50 : x
  2. Step 2: Convert to fraction form
    124.88/187.04 = 81.50/x
  3. Step 3: Cross multiply
    124.88x = 187.04 × 81.50
  4. Step 4: Simplify right side
    124.88x = 15,243.03
  5. Step 5: Solve for x
    x = 15,243.03/124.88
  6. Step 6: Final answer
    x = 122.07

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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.