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Finding the Fourth Proportional to 21,811.68, 32,712.58 and 8,660.52

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Solution

The fourth proportional to 21,811.68, 32,712.58 and 8,660.52 is: 12,988.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,811.68 : 32,712.58 = 8,660.52 : x
  2. Step 2: Convert to fraction form
    21,811.68/32,712.58 = 8,660.52/x
  3. Step 3: Cross multiply
    21,811.68x = 32,712.58 × 8,660.52
  4. Step 4: Simplify right side
    21,811.68x = 283,307,953.34
  5. Step 5: Solve for x
    x = 283,307,953.34/21,811.68
  6. Step 6: Final answer
    x = 12,988.82

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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.