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Finding the Fourth Proportional to 21,419.80, 32,129.70 and 20,982.40

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Solution

The fourth proportional to 21,419.80, 32,129.70 and 20,982.40 is: 31,473.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,419.80 : 32,129.70 = 20,982.40 : x
  2. Step 2: Convert to fraction form
    21,419.80/32,129.70 = 20,982.40/x
  3. Step 3: Cross multiply
    21,419.80x = 32,129.70 × 20,982.40
  4. Step 4: Simplify right side
    21,419.80x = 674,158,217.28
  5. Step 5: Solve for x
    x = 674,158,217.28/21,419.80
  6. Step 6: Final answer
    x = 31,473.60

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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.