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Finding the Fourth Proportional to 8,660.40, 12,990.70 and 3,117.70

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Solution

The fourth proportional to 8,660.40, 12,990.70 and 3,117.70 is: 4,676.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,660.40 : 12,990.70 = 3,117.70 : x
  2. Step 2: Convert to fraction form
    8,660.40/12,990.70 = 3,117.70/x
  3. Step 3: Cross multiply
    8,660.40x = 12,990.70 × 3,117.70
  4. Step 4: Simplify right side
    8,660.40x = 40,501,105.39
  5. Step 5: Solve for x
    x = 40,501,105.39/8,660.40
  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.