Home / 20,687.60-31,031.40-12,393.20

Finding the Fourth Proportional to 20,687.60, 31,031.40 and 12,393.20

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Solution

The fourth proportional to 20,687.60, 31,031.40 and 12,393.20 is: 18,589.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.60 : 31,031.40 = 12,393.20 : x
  2. Step 2: Convert to fraction form
    20,687.60/31,031.40 = 12,393.20/x
  3. Step 3: Cross multiply
    20,687.60x = 31,031.40 × 12,393.20
  4. Step 4: Simplify right side
    20,687.60x = 384,578,346.48
  5. Step 5: Solve for x
    x = 384,578,346.48/20,687.60
  6. Step 6: Final answer
    x = 18,589.80

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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.