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Finding the Fourth Proportional to 112.80, 155.76 and 74.16

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Solution

The fourth proportional to 112.80, 155.76 and 74.16 is: 102.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.80 : 155.76 = 74.16 : x
  2. Step 2: Convert to fraction form
    112.80/155.76 = 74.16/x
  3. Step 3: Cross multiply
    112.80x = 155.76 × 74.16
  4. Step 4: Simplify right side
    112.80x = 11,551.16
  5. Step 5: Solve for x
    x = 11,551.16/112.80
  6. Step 6: Final answer
    x = 102.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.