Home / 20,728.20-31,098.54-12,417.48

Finding the Fourth Proportional to 20,728.20, 31,098.54 and 12,417.48

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Solution

The fourth proportional to 20,728.20, 31,098.54 and 12,417.48 is: 18,629.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,728.20 : 31,098.54 = 12,417.48 : x
  2. Step 2: Convert to fraction form
    20,728.20/31,098.54 = 12,417.48/x
  3. Step 3: Cross multiply
    20,728.20x = 31,098.54 × 12,417.48
  4. Step 4: Simplify right side
    20,728.20x = 386,165,498.48
  5. Step 5: Solve for x
    x = 386,165,498.48/20,728.20
  6. Step 6: Final answer
    x = 18,629.96

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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.