Home / 15,489.18-21,378.87-8,778.77

Finding the Fourth Proportional to 15,489.18, 21,378.87 and 8,778.77

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Solution

The fourth proportional to 15,489.18, 21,378.87 and 8,778.77 is: 12,116.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,489.18 : 21,378.87 = 8,778.77 : x
  2. Step 2: Convert to fraction form
    15,489.18/21,378.87 = 8,778.77/x
  3. Step 3: Cross multiply
    15,489.18x = 21,378.87 × 8,778.77
  4. Step 4: Simplify right side
    15,489.18x = 187,680,182.59
  5. Step 5: Solve for x
    x = 187,680,182.59/15,489.18
  6. Step 6: Final answer
    x = 12,116.86

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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.