Home / 7,721.12-11,581.68-5,129.12

Finding the Fourth Proportional to 7,721.12, 11,581.68 and 5,129.12

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Solution

The fourth proportional to 7,721.12, 11,581.68 and 5,129.12 is: 7,693.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,721.12 : 11,581.68 = 5,129.12 : x
  2. Step 2: Convert to fraction form
    7,721.12/11,581.68 = 5,129.12/x
  3. Step 3: Cross multiply
    7,721.12x = 11,581.68 × 5,129.12
  4. Step 4: Simplify right side
    7,721.12x = 59,403,826.52
  5. Step 5: Solve for x
    x = 59,403,826.52/7,721.12
  6. Step 6: Final answer
    x = 7,693.68

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Similar ratio
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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.