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Finding the Fourth Proportional to 111.48, 153.81 and 74.66

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Solution

The fourth proportional to 111.48, 153.81 and 74.66 is: 103.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.48 : 153.81 = 74.66 : x
  2. Step 2: Convert to fraction form
    111.48/153.81 = 74.66/x
  3. Step 3: Cross multiply
    111.48x = 153.81 × 74.66
  4. Step 4: Simplify right side
    111.48x = 11,482.69
  5. Step 5: Solve for x
    x = 11,482.69/111.48
  6. Step 6: Final answer
    x = 103.00

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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.