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Finding the Fourth Proportional to 115.45, 159.29 and 65.65

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Solution

The fourth proportional to 115.45, 159.29 and 65.65 is: 90.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.45 : 159.29 = 65.65 : x
  2. Step 2: Convert to fraction form
    115.45/159.29 = 65.65/x
  3. Step 3: Cross multiply
    115.45x = 159.29 × 65.65
  4. Step 4: Simplify right side
    115.45x = 10,457.39
  5. Step 5: Solve for x
    x = 10,457.39/115.45
  6. Step 6: Final answer
    x = 90.58

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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.