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Finding the Fourth Proportional to 20,801.80, 31,202.70 and 19,781.20

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Solution

The fourth proportional to 20,801.80, 31,202.70 and 19,781.20 is: 29,671.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,801.80 : 31,202.70 = 19,781.20 : x
  2. Step 2: Convert to fraction form
    20,801.80/31,202.70 = 19,781.20/x
  3. Step 3: Cross multiply
    20,801.80x = 31,202.70 × 19,781.20
  4. Step 4: Simplify right side
    20,801.80x = 617,226,849.24
  5. Step 5: Solve for x
    x = 617,226,849.24/20,801.80
  6. Step 6: Final answer
    x = 29,671.80

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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.