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Finding the Fourth Proportional to 21,824.76, 30,118.16 and 11,888.76

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Solution

The fourth proportional to 21,824.76, 30,118.16 and 11,888.76 is: 16,406.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,824.76 : 30,118.16 = 11,888.76 : x
  2. Step 2: Convert to fraction form
    21,824.76/30,118.16 = 11,888.76/x
  3. Step 3: Cross multiply
    21,824.76x = 30,118.16 × 11,888.76
  4. Step 4: Simplify right side
    21,824.76x = 358,067,575.88
  5. Step 5: Solve for x
    x = 358,067,575.88/21,824.76
  6. Step 6: Final answer
    x = 16,406.48

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Double scale
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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.