Home / 6,521.20-9,781.80-2,139.10

Finding the Fourth Proportional to 6,521.20, 9,781.80 and 2,139.10

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Solution

The fourth proportional to 6,521.20, 9,781.80 and 2,139.10 is: 3,208.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,521.20 : 9,781.80 = 2,139.10 : x
  2. Step 2: Convert to fraction form
    6,521.20/9,781.80 = 2,139.10/x
  3. Step 3: Cross multiply
    6,521.20x = 9,781.80 × 2,139.10
  4. Step 4: Simplify right side
    6,521.20x = 20,924,248.38
  5. Step 5: Solve for x
    x = 20,924,248.38/6,521.20
  6. Step 6: Final answer
    x = 3,208.65

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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.