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Finding the Fourth Proportional to 74.18, 111.02 and 51.39

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Solution

The fourth proportional to 74.18, 111.02 and 51.39 is: 76.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.18 : 111.02 = 51.39 : x
  2. Step 2: Convert to fraction form
    74.18/111.02 = 51.39/x
  3. Step 3: Cross multiply
    74.18x = 111.02 × 51.39
  4. Step 4: Simplify right side
    74.18x = 5,705.06
  5. Step 5: Solve for x
    x = 5,705.06/74.18
  6. Step 6: Final answer
    x = 76.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.