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Finding the Fourth Proportional to 78.60, 117.92 and 38.04

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Solution

The fourth proportional to 78.60, 117.92 and 38.04 is: 57.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.60 : 117.92 = 38.04 : x
  2. Step 2: Convert to fraction form
    78.60/117.92 = 38.04/x
  3. Step 3: Cross multiply
    78.60x = 117.92 × 38.04
  4. Step 4: Simplify right side
    78.60x = 4,485.68
  5. Step 5: Solve for x
    x = 4,485.68/78.60
  6. Step 6: Final answer
    x = 57.07

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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.