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Finding the Fourth Proportional to 116.40, 158.52 and 115.68

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Solution

The fourth proportional to 116.40, 158.52 and 115.68 is: 157.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.40 : 158.52 = 115.68 : x
  2. Step 2: Convert to fraction form
    116.40/158.52 = 115.68/x
  3. Step 3: Cross multiply
    116.40x = 158.52 × 115.68
  4. Step 4: Simplify right side
    116.40x = 18,337.59
  5. Step 5: Solve for x
    x = 18,337.59/116.40
  6. Step 6: Final answer
    x = 157.54

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.