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Finding the Fourth Proportional to 21,690, 32,512.84 and 12,310.20

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Solution

The fourth proportional to 21,690, 32,512.84 and 12,310.20 is: 18,452.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,690 : 32,512.84 = 12,310.20 : x
  2. Step 2: Convert to fraction form
    21,690/32,512.84 = 12,310.20/x
  3. Step 3: Cross multiply
    21,690x = 32,512.84 × 12,310.20
  4. Step 4: Simplify right side
    21,690x = 400,239,532.19
  5. Step 5: Solve for x
    x = 400,239,532.19/21,690
  6. Step 6: Final answer
    x = 18,452.72

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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.