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Finding the Fourth Proportional to 111.51, 153.86 and 74.70

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Solution

The fourth proportional to 111.51, 153.86 and 74.70 is: 103.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.51 : 153.86 = 74.70 : x
  2. Step 2: Convert to fraction form
    111.51/153.86 = 74.70/x
  3. Step 3: Cross multiply
    111.51x = 153.86 × 74.70
  4. Step 4: Simplify right side
    111.51x = 11,492.97
  5. Step 5: Solve for x
    x = 11,492.97/111.51
  6. Step 6: Final answer
    x = 103.07

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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.