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Finding the Fourth Proportional to 21,808.20, 32,712.30 and 20,188.20

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Solution

The fourth proportional to 21,808.20, 32,712.30 and 20,188.20 is: 30,282.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,808.20 : 32,712.30 = 20,188.20 : x
  2. Step 2: Convert to fraction form
    21,808.20/32,712.30 = 20,188.20/x
  3. Step 3: Cross multiply
    21,808.20x = 32,712.30 × 20,188.20
  4. Step 4: Simplify right side
    21,808.20x = 660,402,454.86
  5. Step 5: Solve for x
    x = 660,402,454.86/21,808.20
  6. Step 6: Final answer
    x = 30,282.30

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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.