Home / 21,278.64-31,840.20-12,517.68

Finding the Fourth Proportional to 21,278.64, 31,840.20 and 12,517.68

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Solution

The fourth proportional to 21,278.64, 31,840.20 and 12,517.68 is: 18,730.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,278.64 : 31,840.20 = 12,517.68 : x
  2. Step 2: Convert to fraction form
    21,278.64/31,840.20 = 12,517.68/x
  3. Step 3: Cross multiply
    21,278.64x = 31,840.20 × 12,517.68
  4. Step 4: Simplify right side
    21,278.64x = 398,565,434.74
  5. Step 5: Solve for x
    x = 398,565,434.74/21,278.64
  6. Step 6: Final answer
    x = 18,730.78

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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.