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Finding the Fourth Proportional to 25,456.80, 38,228.40 and 18,890.40

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Solution

The fourth proportional to 25,456.80, 38,228.40 and 18,890.40 is: 28,367.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,456.80 : 38,228.40 = 18,890.40 : x
  2. Step 2: Convert to fraction form
    25,456.80/38,228.40 = 18,890.40/x
  3. Step 3: Cross multiply
    25,456.80x = 38,228.40 × 18,890.40
  4. Step 4: Simplify right side
    25,456.80x = 722,149,767.36
  5. Step 5: Solve for x
    x = 722,149,767.36/25,456.80
  6. Step 6: Final answer
    x = 28,367.66

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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.