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Finding the Fourth Proportional to 7,069.80, 10,605.90 and 2,139.40

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Solution

The fourth proportional to 7,069.80, 10,605.90 and 2,139.40 is: 3,209.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,069.80 : 10,605.90 = 2,139.40 : x
  2. Step 2: Convert to fraction form
    7,069.80/10,605.90 = 2,139.40/x
  3. Step 3: Cross multiply
    7,069.80x = 10,605.90 × 2,139.40
  4. Step 4: Simplify right side
    7,069.80x = 22,690,262.46
  5. Step 5: Solve for x
    x = 22,690,262.46/7,069.80
  6. Step 6: Final answer
    x = 3,209.46

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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.