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Finding the Fourth Proportional to 21,520.70, 32,290.78 and 10,985.28

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Solution

The fourth proportional to 21,520.70, 32,290.78 and 10,985.28 is: 16,482.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,520.70 : 32,290.78 = 10,985.28 : x
  2. Step 2: Convert to fraction form
    21,520.70/32,290.78 = 10,985.28/x
  3. Step 3: Cross multiply
    21,520.70x = 32,290.78 × 10,985.28
  4. Step 4: Simplify right side
    21,520.70x = 354,723,098.26
  5. Step 5: Solve for x
    x = 354,723,098.26/21,520.70
  6. Step 6: Final answer
    x = 16,482.88

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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.