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Finding the Fourth Proportional to 111.65, 153.90 and 100.04

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Solution

The fourth proportional to 111.65, 153.90 and 100.04 is: 137.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.65 : 153.90 = 100.04 : x
  2. Step 2: Convert to fraction form
    111.65/153.90 = 100.04/x
  3. Step 3: Cross multiply
    111.65x = 153.90 × 100.04
  4. Step 4: Simplify right side
    111.65x = 15,395.39
  5. Step 5: Solve for x
    x = 15,395.39/111.65
  6. Step 6: Final answer
    x = 137.90

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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.