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Finding the Fourth Proportional to 21,416.80, 32,125.20 and 20,979.40

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Solution

The fourth proportional to 21,416.80, 32,125.20 and 20,979.40 is: 31,469.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,416.80 : 32,125.20 = 20,979.40 : x
  2. Step 2: Convert to fraction form
    21,416.80/32,125.20 = 20,979.40/x
  3. Step 3: Cross multiply
    21,416.80x = 32,125.20 × 20,979.40
  4. Step 4: Simplify right side
    21,416.80x = 673,967,420.88
  5. Step 5: Solve for x
    x = 673,967,420.88/21,416.80
  6. Step 6: Final answer
    x = 31,469.10

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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.