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Finding the Fourth Proportional to 21,959.42, 32,939.20 and 5,319.42

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Solution

The fourth proportional to 21,959.42, 32,939.20 and 5,319.42 is: 7,979.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,959.42 : 32,939.20 = 5,319.42 : x
  2. Step 2: Convert to fraction form
    21,959.42/32,939.20 = 5,319.42/x
  3. Step 3: Cross multiply
    21,959.42x = 32,939.20 × 5,319.42
  4. Step 4: Simplify right side
    21,959.42x = 175,217,439.26
  5. Step 5: Solve for x
    x = 175,217,439.26/21,959.42
  6. Step 6: Final answer
    x = 7,979.15

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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.