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Finding the Fourth Proportional to 8,660.40, 12,990.69 and 3,117.71

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Solution

The fourth proportional to 8,660.40, 12,990.69 and 3,117.71 is: 4,676.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,660.40 : 12,990.69 = 3,117.71 : x
  2. Step 2: Convert to fraction form
    8,660.40/12,990.69 = 3,117.71/x
  3. Step 3: Cross multiply
    8,660.40x = 12,990.69 × 3,117.71
  4. Step 4: Simplify right side
    8,660.40x = 40,501,139.17
  5. Step 5: Solve for x
    x = 40,501,139.17/8,660.40
  6. Step 6: Final answer
    x = 4,676.59

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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.