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Finding the Fourth Proportional to 15,920.20, 23,905.80 and 12,660.40

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Solution

The fourth proportional to 15,920.20, 23,905.80 and 12,660.40 is: 19,010.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,920.20 : 23,905.80 = 12,660.40 : x
  2. Step 2: Convert to fraction form
    15,920.20/23,905.80 = 12,660.40/x
  3. Step 3: Cross multiply
    15,920.20x = 23,905.80 × 12,660.40
  4. Step 4: Simplify right side
    15,920.20x = 302,656,990.32
  5. Step 5: Solve for x
    x = 302,656,990.32/15,920.20
  6. Step 6: Final answer
    x = 19,010.88

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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.