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Finding the Fourth Proportional to 8,687.78, 11,989.20 and 4,708.92

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Solution

The fourth proportional to 8,687.78, 11,989.20 and 4,708.92 is: 6,498.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.78 : 11,989.20 = 4,708.92 : x
  2. Step 2: Convert to fraction form
    8,687.78/11,989.20 = 4,708.92/x
  3. Step 3: Cross multiply
    8,687.78x = 11,989.20 × 4,708.92
  4. Step 4: Simplify right side
    8,687.78x = 56,456,222.80
  5. Step 5: Solve for x
    x = 56,456,222.80/8,687.78
  6. Step 6: Final answer
    x = 6,498.35

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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.