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Finding the Fourth Proportional to 21,920.52, 32,875.92 and 8,769.36

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Solution

The fourth proportional to 21,920.52, 32,875.92 and 8,769.36 is: 13,152.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,920.52 : 32,875.92 = 8,769.36 : x
  2. Step 2: Convert to fraction form
    21,920.52/32,875.92 = 8,769.36/x
  3. Step 3: Cross multiply
    21,920.52x = 32,875.92 × 8,769.36
  4. Step 4: Simplify right side
    21,920.52x = 288,300,777.81
  5. Step 5: Solve for x
    x = 288,300,777.81/21,920.52
  6. Step 6: Final answer
    x = 13,152.10

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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.