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Finding the Fourth Proportional to 8,687.60, 11,990.13 and 4,911.92

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Solution

The fourth proportional to 8,687.60, 11,990.13 and 4,911.92 is: 6,779.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.60 : 11,990.13 = 4,911.92 : x
  2. Step 2: Convert to fraction form
    8,687.60/11,990.13 = 4,911.92/x
  3. Step 3: Cross multiply
    8,687.60x = 11,990.13 × 4,911.92
  4. Step 4: Simplify right side
    8,687.60x = 58,894,559.35
  5. Step 5: Solve for x
    x = 58,894,559.35/8,687.60
  6. Step 6: Final answer
    x = 6,779.15

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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.