Home / 20,880.29-31,278.69-12,555.72

Finding the Fourth Proportional to 20,880.29, 31,278.69 and 12,555.72

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Solution

The fourth proportional to 20,880.29, 31,278.69 and 12,555.72 is: 18,808.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.29 : 31,278.69 = 12,555.72 : x
  2. Step 2: Convert to fraction form
    20,880.29/31,278.69 = 12,555.72/x
  3. Step 3: Cross multiply
    20,880.29x = 31,278.69 × 12,555.72
  4. Step 4: Simplify right side
    20,880.29x = 392,726,473.61
  5. Step 5: Solve for x
    x = 392,726,473.61/20,880.29
  6. Step 6: Final answer
    x = 18,808.48

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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.