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Finding the Fourth Proportional to 21,879.20, 32,818.80 and 20,919.35

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Solution

The fourth proportional to 21,879.20, 32,818.80 and 20,919.35 is: 31,379.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,879.20 : 32,818.80 = 20,919.35 : x
  2. Step 2: Convert to fraction form
    21,879.20/32,818.80 = 20,919.35/x
  3. Step 3: Cross multiply
    21,879.20x = 32,818.80 × 20,919.35
  4. Step 4: Simplify right side
    21,879.20x = 686,547,963.78
  5. Step 5: Solve for x
    x = 686,547,963.78/21,879.20
  6. Step 6: Final answer
    x = 31,379.03

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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.