Home / 20,754.91-31,140.18-12,440.90

Finding the Fourth Proportional to 20,754.91, 31,140.18 and 12,440.90

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Solution

The fourth proportional to 20,754.91, 31,140.18 and 12,440.90 is: 18,666.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,754.91 : 31,140.18 = 12,440.90 : x
  2. Step 2: Convert to fraction form
    20,754.91/31,140.18 = 12,440.90/x
  3. Step 3: Cross multiply
    20,754.91x = 31,140.18 × 12,440.90
  4. Step 4: Simplify right side
    20,754.91x = 387,411,943.21
  5. Step 5: Solve for x
    x = 387,411,943.21/20,754.91
  6. Step 6: Final answer
    x = 18,666.04

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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.