Home / 15,761.35-21,750.55-8,687.76

Finding the Fourth Proportional to 15,761.35, 21,750.55 and 8,687.76

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Solution

The fourth proportional to 15,761.35, 21,750.55 and 8,687.76 is: 11,989.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,761.35 : 21,750.55 = 8,687.76 : x
  2. Step 2: Convert to fraction form
    15,761.35/21,750.55 = 8,687.76/x
  3. Step 3: Cross multiply
    15,761.35x = 21,750.55 × 8,687.76
  4. Step 4: Simplify right side
    15,761.35x = 188,963,558.27
  5. Step 5: Solve for x
    x = 188,963,558.27/15,761.35
  6. Step 6: Final answer
    x = 11,989.05

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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.