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Finding the Fourth Proportional to 21,324.60, 31,959.90 and 8,159.40

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Solution

The fourth proportional to 21,324.60, 31,959.90 and 8,159.40 is: 12,228.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,324.60 : 31,959.90 = 8,159.40 : x
  2. Step 2: Convert to fraction form
    21,324.60/31,959.90 = 8,159.40/x
  3. Step 3: Cross multiply
    21,324.60x = 31,959.90 × 8,159.40
  4. Step 4: Simplify right side
    21,324.60x = 260,773,608.06
  5. Step 5: Solve for x
    x = 260,773,608.06/21,324.60
  6. Step 6: Final answer
    x = 12,228.77

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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.