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Finding the Fourth Proportional to 74.50, 111.78 and 38.45

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Solution

The fourth proportional to 74.50, 111.78 and 38.45 is: 57.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.50 : 111.78 = 38.45 : x
  2. Step 2: Convert to fraction form
    74.50/111.78 = 38.45/x
  3. Step 3: Cross multiply
    74.50x = 111.78 × 38.45
  4. Step 4: Simplify right side
    74.50x = 4,298.22
  5. Step 5: Solve for x
    x = 4,298.22/74.50
  6. Step 6: Final answer
    x = 57.70

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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.