Home / 20,754.33-31,139.34-12,440.28

Finding the Fourth Proportional to 20,754.33, 31,139.34 and 12,440.28

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Solution

The fourth proportional to 20,754.33, 31,139.34 and 12,440.28 is: 18,665.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,754.33 : 31,139.34 = 12,440.28 : x
  2. Step 2: Convert to fraction form
    20,754.33/31,139.34 = 12,440.28/x
  3. Step 3: Cross multiply
    20,754.33x = 31,139.34 × 12,440.28
  4. Step 4: Simplify right side
    20,754.33x = 387,382,178.74
  5. Step 5: Solve for x
    x = 387,382,178.74/20,754.33
  6. Step 6: Final answer
    x = 18,665.13

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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.