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Finding the Fourth Proportional to 115.68, 172.80 and 88.68

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Solution

The fourth proportional to 115.68, 172.80 and 88.68 is: 132.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.68 : 172.80 = 88.68 : x
  2. Step 2: Convert to fraction form
    115.68/172.80 = 88.68/x
  3. Step 3: Cross multiply
    115.68x = 172.80 × 88.68
  4. Step 4: Simplify right side
    115.68x = 15,323.90
  5. Step 5: Solve for x
    x = 15,323.90/115.68
  6. Step 6: Final answer
    x = 132.47

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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.