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Finding the Fourth Proportional to 21,311.60, 32,005.80 and 20,620.40

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Solution

The fourth proportional to 21,311.60, 32,005.80 and 20,620.40 is: 30,967.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,311.60 : 32,005.80 = 20,620.40 : x
  2. Step 2: Convert to fraction form
    21,311.60/32,005.80 = 20,620.40/x
  3. Step 3: Cross multiply
    21,311.60x = 32,005.80 × 20,620.40
  4. Step 4: Simplify right side
    21,311.60x = 659,972,398.32
  5. Step 5: Solve for x
    x = 659,972,398.32/21,311.60
  6. Step 6: Final answer
    x = 30,967.75

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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.