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Finding the Fourth Proportional to 115.08, 158.94 and 87.45

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Solution

The fourth proportional to 115.08, 158.94 and 87.45 is: 120.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.08 : 158.94 = 87.45 : x
  2. Step 2: Convert to fraction form
    115.08/158.94 = 87.45/x
  3. Step 3: Cross multiply
    115.08x = 158.94 × 87.45
  4. Step 4: Simplify right side
    115.08x = 13,899.30
  5. Step 5: Solve for x
    x = 13,899.30/115.08
  6. Step 6: Final answer
    x = 120.78

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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.