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Finding the Fourth Proportional to 25,691.80, 38,464.80 and 19,811.20

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Solution

The fourth proportional to 25,691.80, 38,464.80 and 19,811.20 is: 29,660.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,691.80 : 38,464.80 = 19,811.20 : x
  2. Step 2: Convert to fraction form
    25,691.80/38,464.80 = 19,811.20/x
  3. Step 3: Cross multiply
    25,691.80x = 38,464.80 × 19,811.20
  4. Step 4: Simplify right side
    25,691.80x = 762,033,845.76
  5. Step 5: Solve for x
    x = 762,033,845.76/25,691.80
  6. Step 6: Final answer
    x = 29,660.59

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1.5x scale

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.