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Finding the Fourth Proportional to 158.89, 219.54 and 115.15

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Solution

The fourth proportional to 158.89, 219.54 and 115.15 is: 159.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.89 : 219.54 = 115.15 : x
  2. Step 2: Convert to fraction form
    158.89/219.54 = 115.15/x
  3. Step 3: Cross multiply
    158.89x = 219.54 × 115.15
  4. Step 4: Simplify right side
    158.89x = 25,280.03
  5. Step 5: Solve for x
    x = 25,280.03/158.89
  6. Step 6: Final answer
    x = 159.10

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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.