Home / 19,920.61-29,882.40-5,129.65

Finding the Fourth Proportional to 19,920.61, 29,882.40 and 5,129.65

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Solution

The fourth proportional to 19,920.61, 29,882.40 and 5,129.65 is: 7,694.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920.61 : 29,882.40 = 5,129.65 : x
  2. Step 2: Convert to fraction form
    19,920.61/29,882.40 = 5,129.65/x
  3. Step 3: Cross multiply
    19,920.61x = 29,882.40 × 5,129.65
  4. Step 4: Simplify right side
    19,920.61x = 153,286,253.16
  5. Step 5: Solve for x
    x = 153,286,253.16/19,920.61
  6. Step 6: Final answer
    x = 7,694.86

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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.