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Finding the Fourth Proportional to 111.30, 153.93 and 99.63

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Solution

The fourth proportional to 111.30, 153.93 and 99.63 is: 137.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.30 : 153.93 = 99.63 : x
  2. Step 2: Convert to fraction form
    111.30/153.93 = 99.63/x
  3. Step 3: Cross multiply
    111.30x = 153.93 × 99.63
  4. Step 4: Simplify right side
    111.30x = 15,336.05
  5. Step 5: Solve for x
    x = 15,336.05/111.30
  6. Step 6: Final answer
    x = 137.79

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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.