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Finding the Fourth Proportional to 8,976.74, 12,389.78 and 5,391.85

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Solution

The fourth proportional to 8,976.74, 12,389.78 and 5,391.85 is: 7,441.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,976.74 : 12,389.78 = 5,391.85 : x
  2. Step 2: Convert to fraction form
    8,976.74/12,389.78 = 5,391.85/x
  3. Step 3: Cross multiply
    8,976.74x = 12,389.78 × 5,391.85
  4. Step 4: Simplify right side
    8,976.74x = 66,803,823.82
  5. Step 5: Solve for x
    x = 66,803,823.82/8,976.74
  6. Step 6: Final answer
    x = 7,441.88

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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.