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Finding the Fourth Proportional to 21,806.20, 32,660.70 and 18,890.20

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Solution

The fourth proportional to 21,806.20, 32,660.70 and 18,890.20 is: 28,293.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,806.20 : 32,660.70 = 18,890.20 : x
  2. Step 2: Convert to fraction form
    21,806.20/32,660.70 = 18,890.20/x
  3. Step 3: Cross multiply
    21,806.20x = 32,660.70 × 18,890.20
  4. Step 4: Simplify right side
    21,806.20x = 616,967,155.14
  5. Step 5: Solve for x
    x = 616,967,155.14/21,806.20
  6. Step 6: Final answer
    x = 28,293.20

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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.