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Finding the Fourth Proportional to 111.14, 153.19 and 77.99

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Solution

The fourth proportional to 111.14, 153.19 and 77.99 is: 107.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.14 : 153.19 = 77.99 : x
  2. Step 2: Convert to fraction form
    111.14/153.19 = 77.99/x
  3. Step 3: Cross multiply
    111.14x = 153.19 × 77.99
  4. Step 4: Simplify right side
    111.14x = 11,947.29
  5. Step 5: Solve for x
    x = 11,947.29/111.14
  6. Step 6: Final answer
    x = 107.50

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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.