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Finding the Fourth Proportional to 111.36, 153.70 and 72.56

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Solution

The fourth proportional to 111.36, 153.70 and 72.56 is: 100.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.36 : 153.70 = 72.56 : x
  2. Step 2: Convert to fraction form
    111.36/153.70 = 72.56/x
  3. Step 3: Cross multiply
    111.36x = 153.70 × 72.56
  4. Step 4: Simplify right side
    111.36x = 11,152.47
  5. Step 5: Solve for x
    x = 11,152.47/111.36
  6. Step 6: Final answer
    x = 100.15

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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.