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Finding the Fourth Proportional to 21,251.90, 31,899.32 and 8,779.34

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Solution

The fourth proportional to 21,251.90, 31,899.32 and 8,779.34 is: 13,177.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,251.90 : 31,899.32 = 8,779.34 : x
  2. Step 2: Convert to fraction form
    21,251.90/31,899.32 = 8,779.34/x
  3. Step 3: Cross multiply
    21,251.90x = 31,899.32 × 8,779.34
  4. Step 4: Simplify right side
    21,251.90x = 280,054,976.05
  5. Step 5: Solve for x
    x = 280,054,976.05/21,251.90
  6. Step 6: Final answer
    x = 13,177.88

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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.