Home / 5,638.65-7,781.28-3,120.76

Finding the Fourth Proportional to 5,638.65, 7,781.28 and 3,120.76

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Solution

The fourth proportional to 5,638.65, 7,781.28 and 3,120.76 is: 4,306.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,638.65 : 7,781.28 = 3,120.76 : x
  2. Step 2: Convert to fraction form
    5,638.65/7,781.28 = 3,120.76/x
  3. Step 3: Cross multiply
    5,638.65x = 7,781.28 × 3,120.76
  4. Step 4: Simplify right side
    5,638.65x = 24,283,515.12
  5. Step 5: Solve for x
    x = 24,283,515.12/5,638.65
  6. Step 6: Final answer
    x = 4,306.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.