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Finding the Fourth Proportional to 19,920.25, 27,489.95 and 11,088.25

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Solution

The fourth proportional to 19,920.25, 27,489.95 and 11,088.25 is: 15,301.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920.25 : 27,489.95 = 11,088.25 : x
  2. Step 2: Convert to fraction form
    19,920.25/27,489.95 = 11,088.25/x
  3. Step 3: Cross multiply
    19,920.25x = 27,489.95 × 11,088.25
  4. Step 4: Simplify right side
    19,920.25x = 304,815,382.65
  5. Step 5: Solve for x
    x = 304,815,382.65/19,920.25
  6. Step 6: Final answer
    x = 15,301.79

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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.