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Finding the Fourth Proportional to 19,909.60, 29,821.20 and 17,720.80

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Solution

The fourth proportional to 19,909.60, 29,821.20 and 17,720.80 is: 26,542.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,909.60 : 29,821.20 = 17,720.80 : x
  2. Step 2: Convert to fraction form
    19,909.60/29,821.20 = 17,720.80/x
  3. Step 3: Cross multiply
    19,909.60x = 29,821.20 × 17,720.80
  4. Step 4: Simplify right side
    19,909.60x = 528,455,520.96
  5. Step 5: Solve for x
    x = 528,455,520.96/19,909.60
  6. Step 6: Final answer
    x = 26,542.75

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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.