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Finding the Fourth Proportional to 115.38, 172.90 and 53.70

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Solution

The fourth proportional to 115.38, 172.90 and 53.70 is: 80.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.38 : 172.90 = 53.70 : x
  2. Step 2: Convert to fraction form
    115.38/172.90 = 53.70/x
  3. Step 3: Cross multiply
    115.38x = 172.90 × 53.70
  4. Step 4: Simplify right side
    115.38x = 9,284.80
  5. Step 5: Solve for x
    x = 9,284.80/115.38
  6. Step 6: Final answer
    x = 80.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.