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Finding the Fourth Proportional to 6,139.80, 9,209.70 and 2,859.30

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Solution

The fourth proportional to 6,139.80, 9,209.70 and 2,859.30 is: 4,288.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,139.80 : 9,209.70 = 2,859.30 : x
  2. Step 2: Convert to fraction form
    6,139.80/9,209.70 = 2,859.30/x
  3. Step 3: Cross multiply
    6,139.80x = 9,209.70 × 2,859.30
  4. Step 4: Simplify right side
    6,139.80x = 26,333,295.21
  5. Step 5: Solve for x
    x = 26,333,295.21/6,139.80
  6. Step 6: Final answer
    x = 4,288.95

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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.