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Finding the Fourth Proportional to 115.40, 158.88 and 112.04

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Solution

The fourth proportional to 115.40, 158.88 and 112.04 is: 154.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.40 : 158.88 = 112.04 : x
  2. Step 2: Convert to fraction form
    115.40/158.88 = 112.04/x
  3. Step 3: Cross multiply
    115.40x = 158.88 × 112.04
  4. Step 4: Simplify right side
    115.40x = 17,800.92
  5. Step 5: Solve for x
    x = 17,800.92/115.40
  6. Step 6: Final answer
    x = 154.25

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