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Finding the Fourth Proportional to 105.56, 158.08 and 87.40

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Solution

The fourth proportional to 105.56, 158.08 and 87.40 is: 130.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.56 : 158.08 = 87.40 : x
  2. Step 2: Convert to fraction form
    105.56/158.08 = 87.40/x
  3. Step 3: Cross multiply
    105.56x = 158.08 × 87.40
  4. Step 4: Simplify right side
    105.56x = 13,816.19
  5. Step 5: Solve for x
    x = 13,816.19/105.56
  6. Step 6: Final answer
    x = 130.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.