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Finding the Fourth Proportional to 25,876.80, 38,815.20 and 7,408.80

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Solution

The fourth proportional to 25,876.80, 38,815.20 and 7,408.80 is: 11,113.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,876.80 : 38,815.20 = 7,408.80 : x
  2. Step 2: Convert to fraction form
    25,876.80/38,815.20 = 7,408.80/x
  3. Step 3: Cross multiply
    25,876.80x = 38,815.20 × 7,408.80
  4. Step 4: Simplify right side
    25,876.80x = 287,574,053.76
  5. Step 5: Solve for x
    x = 287,574,053.76/25,876.80
  6. Step 6: Final answer
    x = 11,113.20

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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.