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Finding the Fourth Proportional to 21,896.40, 32,868.90 and 13,585.80

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Solution

The fourth proportional to 21,896.40, 32,868.90 and 13,585.80 is: 20,393.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,896.40 : 32,868.90 = 13,585.80 : x
  2. Step 2: Convert to fraction form
    21,896.40/32,868.90 = 13,585.80/x
  3. Step 3: Cross multiply
    21,896.40x = 32,868.90 × 13,585.80
  4. Step 4: Simplify right side
    21,896.40x = 446,550,301.62
  5. Step 5: Solve for x
    x = 446,550,301.62/21,896.40
  6. Step 6: Final answer
    x = 20,393.78

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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.