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Finding the Fourth Proportional to 19,761.88, 27,281.30 and 15,275.48

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Solution

The fourth proportional to 19,761.88, 27,281.30 and 15,275.48 is: 21,087.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,761.88 : 27,281.30 = 15,275.48 : x
  2. Step 2: Convert to fraction form
    19,761.88/27,281.30 = 15,275.48/x
  3. Step 3: Cross multiply
    19,761.88x = 27,281.30 × 15,275.48
  4. Step 4: Simplify right side
    19,761.88x = 416,734,952.52
  5. Step 5: Solve for x
    x = 416,734,952.52/19,761.88
  6. Step 6: Final answer
    x = 21,087.82

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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.