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Finding the Fourth Proportional to 115.65, 159.68 and 106.40

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Solution

The fourth proportional to 115.65, 159.68 and 106.40 is: 146.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.65 : 159.68 = 106.40 : x
  2. Step 2: Convert to fraction form
    115.65/159.68 = 106.40/x
  3. Step 3: Cross multiply
    115.65x = 159.68 × 106.40
  4. Step 4: Simplify right side
    115.65x = 16,990.62
  5. Step 5: Solve for x
    x = 16,990.62/115.65
  6. Step 6: Final answer
    x = 146.91

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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.