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Finding the Fourth Proportional to 111.18, 153.36 and 72.36

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Solution

The fourth proportional to 111.18, 153.36 and 72.36 is: 99.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.18 : 153.36 = 72.36 : x
  2. Step 2: Convert to fraction form
    111.18/153.36 = 72.36/x
  3. Step 3: Cross multiply
    111.18x = 153.36 × 72.36
  4. Step 4: Simplify right side
    111.18x = 11,097.13
  5. Step 5: Solve for x
    x = 11,097.13/111.18
  6. Step 6: Final answer
    x = 99.81

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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.