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Finding the Fourth Proportional to 8,815.70, 13,205.15 and 4,139.70

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Solution

The fourth proportional to 8,815.70, 13,205.15 and 4,139.70 is: 6,200.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,815.70 : 13,205.15 = 4,139.70 : x
  2. Step 2: Convert to fraction form
    8,815.70/13,205.15 = 4,139.70/x
  3. Step 3: Cross multiply
    8,815.70x = 13,205.15 × 4,139.70
  4. Step 4: Simplify right side
    8,815.70x = 54,665,359.46
  5. Step 5: Solve for x
    x = 54,665,359.46/8,815.70
  6. Step 6: Final answer
    x = 6,200.91

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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.