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Finding the Fourth Proportional to 10,867.76, 15,000.78 and 6,391.76

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Solution

The fourth proportional to 10,867.76, 15,000.78 and 6,391.76 is: 8,822.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,867.76 : 15,000.78 = 6,391.76 : x
  2. Step 2: Convert to fraction form
    10,867.76/15,000.78 = 6,391.76/x
  3. Step 3: Cross multiply
    10,867.76x = 15,000.78 × 6,391.76
  4. Step 4: Simplify right side
    10,867.76x = 95,881,385.57
  5. Step 5: Solve for x
    x = 95,881,385.57/10,867.76
  6. Step 6: Final answer
    x = 8,822.55

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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.