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Finding the Fourth Proportional to 115.29, 158.55 and 102.99

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Solution

The fourth proportional to 115.29, 158.55 and 102.99 is: 141.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.29 : 158.55 = 102.99 : x
  2. Step 2: Convert to fraction form
    115.29/158.55 = 102.99/x
  3. Step 3: Cross multiply
    115.29x = 158.55 × 102.99
  4. Step 4: Simplify right side
    115.29x = 16,329.06
  5. Step 5: Solve for x
    x = 16,329.06/115.29
  6. Step 6: Final answer
    x = 141.63

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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.