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Finding the Fourth Proportional to 21,929.76, 32,898.96 and 8,078.88

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Solution

The fourth proportional to 21,929.76, 32,898.96 and 8,078.88 is: 12,119.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,929.76 : 32,898.96 = 8,078.88 : x
  2. Step 2: Convert to fraction form
    21,929.76/32,898.96 = 8,078.88/x
  3. Step 3: Cross multiply
    21,929.76x = 32,898.96 × 8,078.88
  4. Step 4: Simplify right side
    21,929.76x = 265,786,749.96
  5. Step 5: Solve for x
    x = 265,786,749.96/21,929.76
  6. Step 6: Final answer
    x = 12,119.91

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1.5x scale

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.