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Finding the Fourth Proportional to 111.40, 153.61 and 72.57

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Solution

The fourth proportional to 111.40, 153.61 and 72.57 is: 100.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.40 : 153.61 = 72.57 : x
  2. Step 2: Convert to fraction form
    111.40/153.61 = 72.57/x
  3. Step 3: Cross multiply
    111.40x = 153.61 × 72.57
  4. Step 4: Simplify right side
    111.40x = 11,147.48
  5. Step 5: Solve for x
    x = 11,147.48/111.40
  6. Step 6: Final answer
    x = 100.07

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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.