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Finding the Fourth Proportional to 74.35, 111.51 and 25.60

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Solution

The fourth proportional to 74.35, 111.51 and 25.60 is: 38.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.35 : 111.51 = 25.60 : x
  2. Step 2: Convert to fraction form
    74.35/111.51 = 25.60/x
  3. Step 3: Cross multiply
    74.35x = 111.51 × 25.60
  4. Step 4: Simplify right side
    74.35x = 2,854.66
  5. Step 5: Solve for x
    x = 2,854.66/74.35
  6. Step 6: Final answer
    x = 38.39

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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.