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Finding the Fourth Proportional to 8,661.52, 12,990.84 and 3,113.74

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Solution

The fourth proportional to 8,661.52, 12,990.84 and 3,113.74 is: 4,670.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,661.52 : 12,990.84 = 3,113.74 : x
  2. Step 2: Convert to fraction form
    8,661.52/12,990.84 = 3,113.74/x
  3. Step 3: Cross multiply
    8,661.52x = 12,990.84 × 3,113.74
  4. Step 4: Simplify right side
    8,661.52x = 40,450,098.14
  5. Step 5: Solve for x
    x = 40,450,098.14/8,661.52
  6. Step 6: Final answer
    x = 4,670.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.