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Finding the Fourth Proportional to 21,745.80, 32,545.80 and 19,121.40

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Solution

The fourth proportional to 21,745.80, 32,545.80 and 19,121.40 is: 28,618.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,745.80 : 32,545.80 = 19,121.40 : x
  2. Step 2: Convert to fraction form
    21,745.80/32,545.80 = 19,121.40/x
  3. Step 3: Cross multiply
    21,745.80x = 32,545.80 × 19,121.40
  4. Step 4: Simplify right side
    21,745.80x = 622,321,260.12
  5. Step 5: Solve for x
    x = 622,321,260.12/21,745.80
  6. Step 6: Final answer
    x = 28,618.00

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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.