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Finding the Fourth Proportional to 115.10, 158.55 and 89.18

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Solution

The fourth proportional to 115.10, 158.55 and 89.18 is: 122.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.10 : 158.55 = 89.18 : x
  2. Step 2: Convert to fraction form
    115.10/158.55 = 89.18/x
  3. Step 3: Cross multiply
    115.10x = 158.55 × 89.18
  4. Step 4: Simplify right side
    115.10x = 14,139.49
  5. Step 5: Solve for x
    x = 14,139.49/115.10
  6. Step 6: Final answer
    x = 122.85

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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.