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Finding the Fourth Proportional to 21,815.70, 32,721.71 and 8,664.54

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Solution

The fourth proportional to 21,815.70, 32,721.71 and 8,664.54 is: 12,996.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,815.70 : 32,721.71 = 8,664.54 : x
  2. Step 2: Convert to fraction form
    21,815.70/32,721.71 = 8,664.54/x
  3. Step 3: Cross multiply
    21,815.70x = 32,721.71 × 8,664.54
  4. Step 4: Simplify right side
    21,815.70x = 283,518,565.16
  5. Step 5: Solve for x
    x = 283,518,565.16/21,815.70
  6. Step 6: Final answer
    x = 12,996.08

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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.