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Finding the Fourth Proportional to 124.02, 186.05 and 42.87

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Solution

The fourth proportional to 124.02, 186.05 and 42.87 is: 64.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.02 : 186.05 = 42.87 : x
  2. Step 2: Convert to fraction form
    124.02/186.05 = 42.87/x
  3. Step 3: Cross multiply
    124.02x = 186.05 × 42.87
  4. Step 4: Simplify right side
    124.02x = 7,976.77
  5. Step 5: Solve for x
    x = 7,976.77/124.02
  6. Step 6: Final answer
    x = 64.32

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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.