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Finding the Fourth Proportional to 38,474.80, 57,728.40 and 20,957.20

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Solution

The fourth proportional to 38,474.80, 57,728.40 and 20,957.20 is: 31,444.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,474.80 : 57,728.40 = 20,957.20 : x
  2. Step 2: Convert to fraction form
    38,474.80/57,728.40 = 20,957.20/x
  3. Step 3: Cross multiply
    38,474.80x = 57,728.40 × 20,957.20
  4. Step 4: Simplify right side
    38,474.80x = 1,209,825,624.48
  5. Step 5: Solve for x
    x = 1,209,825,624.48/38,474.80
  6. Step 6: Final answer
    x = 31,444.62

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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.