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Finding the Fourth Proportional to 6,608.20, 9,890.70 and 5,139.40

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Solution

The fourth proportional to 6,608.20, 9,890.70 and 5,139.40 is: 7,692.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,608.20 : 9,890.70 = 5,139.40 : x
  2. Step 2: Convert to fraction form
    6,608.20/9,890.70 = 5,139.40/x
  3. Step 3: Cross multiply
    6,608.20x = 9,890.70 × 5,139.40
  4. Step 4: Simplify right side
    6,608.20x = 50,832,263.58
  5. Step 5: Solve for x
    x = 50,832,263.58/6,608.20
  6. Step 6: Final answer
    x = 7,692.30

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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.