Home / 15,753.80-21,740.50-8,680.12

Finding the Fourth Proportional to 15,753.80, 21,740.50 and 8,680.12

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Solution

The fourth proportional to 15,753.80, 21,740.50 and 8,680.12 is: 11,978.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,753.80 : 21,740.50 = 8,680.12 : x
  2. Step 2: Convert to fraction form
    15,753.80/21,740.50 = 8,680.12/x
  3. Step 3: Cross multiply
    15,753.80x = 21,740.50 × 8,680.12
  4. Step 4: Simplify right side
    15,753.80x = 188,710,148.86
  5. Step 5: Solve for x
    x = 188,710,148.86/15,753.80
  6. Step 6: Final answer
    x = 11,978.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.