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Finding the Fourth Proportional to 21,947.40, 32,929.20 and 8,809.20

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Solution

The fourth proportional to 21,947.40, 32,929.20 and 8,809.20 is: 13,217.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,947.40 : 32,929.20 = 8,809.20 : x
  2. Step 2: Convert to fraction form
    21,947.40/32,929.20 = 8,809.20/x
  3. Step 3: Cross multiply
    21,947.40x = 32,929.20 × 8,809.20
  4. Step 4: Simplify right side
    21,947.40x = 290,079,908.64
  5. Step 5: Solve for x
    x = 290,079,908.64/21,947.40
  6. Step 6: Final answer
    x = 13,217.05

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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.