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Finding the Fourth Proportional to 78.12, 116.46 and 74.04

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Solution

The fourth proportional to 78.12, 116.46 and 74.04 is: 110.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.12 : 116.46 = 74.04 : x
  2. Step 2: Convert to fraction form
    78.12/116.46 = 74.04/x
  3. Step 3: Cross multiply
    78.12x = 116.46 × 74.04
  4. Step 4: Simplify right side
    78.12x = 8,622.70
  5. Step 5: Solve for x
    x = 8,622.70/78.12
  6. Step 6: Final answer
    x = 110.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.