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Finding the Fourth Proportional to 115.75, 160.08 and 103.45

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Solution

The fourth proportional to 115.75, 160.08 and 103.45 is: 143.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.75 : 160.08 = 103.45 : x
  2. Step 2: Convert to fraction form
    115.75/160.08 = 103.45/x
  3. Step 3: Cross multiply
    115.75x = 160.08 × 103.45
  4. Step 4: Simplify right side
    115.75x = 16,560.28
  5. Step 5: Solve for x
    x = 16,560.28/115.75
  6. Step 6: Final answer
    x = 143.07

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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.