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Finding the Fourth Proportional to 114.88, 172.24 and 90.88

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Solution

The fourth proportional to 114.88, 172.24 and 90.88 is: 136.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.88 : 172.24 = 90.88 : x
  2. Step 2: Convert to fraction form
    114.88/172.24 = 90.88/x
  3. Step 3: Cross multiply
    114.88x = 172.24 × 90.88
  4. Step 4: Simplify right side
    114.88x = 15,653.17
  5. Step 5: Solve for x
    x = 15,653.17/114.88
  6. Step 6: Final answer
    x = 136.26

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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.