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Finding the Fourth Proportional to 124.02, 185.92 and 78.39

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Solution

The fourth proportional to 124.02, 185.92 and 78.39 is: 117.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.02 : 185.92 = 78.39 : x
  2. Step 2: Convert to fraction form
    124.02/185.92 = 78.39/x
  3. Step 3: Cross multiply
    124.02x = 185.92 × 78.39
  4. Step 4: Simplify right side
    124.02x = 14,574.07
  5. Step 5: Solve for x
    x = 14,574.07/124.02
  6. Step 6: Final answer
    x = 117.51

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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.