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Finding the Fourth Proportional to 21,775.80, 32,702.10 and 16,857.40

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Solution

The fourth proportional to 21,775.80, 32,702.10 and 16,857.40 is: 25,315.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,775.80 : 32,702.10 = 16,857.40 : x
  2. Step 2: Convert to fraction form
    21,775.80/32,702.10 = 16,857.40/x
  3. Step 3: Cross multiply
    21,775.80x = 32,702.10 × 16,857.40
  4. Step 4: Simplify right side
    21,775.80x = 551,272,380.54
  5. Step 5: Solve for x
    x = 551,272,380.54/21,775.80
  6. Step 6: Final answer
    x = 25,315.83

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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.