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Finding the Fourth Proportional to 21,808.20, 32,712.30 and 20,123.40

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Solution

The fourth proportional to 21,808.20, 32,712.30 and 20,123.40 is: 30,185.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,808.20 : 32,712.30 = 20,123.40 : x
  2. Step 2: Convert to fraction form
    21,808.20/32,712.30 = 20,123.40/x
  3. Step 3: Cross multiply
    21,808.20x = 32,712.30 × 20,123.40
  4. Step 4: Simplify right side
    21,808.20x = 658,282,697.82
  5. Step 5: Solve for x
    x = 658,282,697.82/21,808.20
  6. Step 6: Final answer
    x = 30,185.10

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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.