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Finding the Fourth Proportional to 38,499.80, 57,720.90 and 20,989.40

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Solution

The fourth proportional to 38,499.80, 57,720.90 and 20,989.40 is: 31,468.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,499.80 : 57,720.90 = 20,989.40 : x
  2. Step 2: Convert to fraction form
    38,499.80/57,720.90 = 20,989.40/x
  3. Step 3: Cross multiply
    38,499.80x = 57,720.90 × 20,989.40
  4. Step 4: Simplify right side
    38,499.80x = 1,211,527,058.46
  5. Step 5: Solve for x
    x = 1,211,527,058.46/38,499.80
  6. Step 6: Final answer
    x = 31,468.40

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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.