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Finding the Fourth Proportional to 115.62, 172.59 and 98.38

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Solution

The fourth proportional to 115.62, 172.59 and 98.38 is: 146.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.62 : 172.59 = 98.38 : x
  2. Step 2: Convert to fraction form
    115.62/172.59 = 98.38/x
  3. Step 3: Cross multiply
    115.62x = 172.59 × 98.38
  4. Step 4: Simplify right side
    115.62x = 16,979.40
  5. Step 5: Solve for x
    x = 16,979.40/115.62
  6. Step 6: Final answer
    x = 146.86

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.