Home / 20,643.40-28,488.22-11,211.92

Finding the Fourth Proportional to 20,643.40, 28,488.22 and 11,211.92

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Solution

The fourth proportional to 20,643.40, 28,488.22 and 11,211.92 is: 15,472.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.40 : 28,488.22 = 11,211.92 : x
  2. Step 2: Convert to fraction form
    20,643.40/28,488.22 = 11,211.92/x
  3. Step 3: Cross multiply
    20,643.40x = 28,488.22 × 11,211.92
  4. Step 4: Simplify right side
    20,643.40x = 319,407,643.58
  5. Step 5: Solve for x
    x = 319,407,643.58/20,643.40
  6. Step 6: Final answer
    x = 15,472.63

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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.