Home / 15,385.34-21,231.78-8,311.76

Finding the Fourth Proportional to 15,385.34, 21,231.78 and 8,311.76

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Solution

The fourth proportional to 15,385.34, 21,231.78 and 8,311.76 is: 11,470.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,385.34 : 21,231.78 = 8,311.76 : x
  2. Step 2: Convert to fraction form
    15,385.34/21,231.78 = 8,311.76/x
  3. Step 3: Cross multiply
    15,385.34x = 21,231.78 × 8,311.76
  4. Step 4: Simplify right side
    15,385.34x = 176,473,459.73
  5. Step 5: Solve for x
    x = 176,473,459.73/15,385.34
  6. Step 6: Final answer
    x = 11,470.23

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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.