Home / 38,490.40-57,721.20-13,520.80

Finding the Fourth Proportional to 38,490.40, 57,721.20 and 13,520.80

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Solution

The fourth proportional to 38,490.40, 57,721.20 and 13,520.80 is: 20,276.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,490.40 : 57,721.20 = 13,520.80 : x
  2. Step 2: Convert to fraction form
    38,490.40/57,721.20 = 13,520.80/x
  3. Step 3: Cross multiply
    38,490.40x = 57,721.20 × 13,520.80
  4. Step 4: Simplify right side
    38,490.40x = 780,436,800.96
  5. Step 5: Solve for x
    x = 780,436,800.96/38,490.40
  6. Step 6: Final answer
    x = 20,276.14

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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.