Home / 20,868.19-31,260.54-12,543.68

Finding the Fourth Proportional to 20,868.19, 31,260.54 and 12,543.68

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Solution

The fourth proportional to 20,868.19, 31,260.54 and 12,543.68 is: 18,790.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,868.19 : 31,260.54 = 12,543.68 : x
  2. Step 2: Convert to fraction form
    20,868.19/31,260.54 = 12,543.68/x
  3. Step 3: Cross multiply
    20,868.19x = 31,260.54 × 12,543.68
  4. Step 4: Simplify right side
    20,868.19x = 392,122,210.39
  5. Step 5: Solve for x
    x = 392,122,210.39/20,868.19
  6. Step 6: Final answer
    x = 18,790.43

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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.