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Finding the Fourth Proportional to 21,545.80, 32,245.80 and 18,921.40

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Solution

The fourth proportional to 21,545.80, 32,245.80 and 18,921.40 is: 28,318.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,545.80 : 32,245.80 = 18,921.40 : x
  2. Step 2: Convert to fraction form
    21,545.80/32,245.80 = 18,921.40/x
  3. Step 3: Cross multiply
    21,545.80x = 32,245.80 × 18,921.40
  4. Step 4: Simplify right side
    21,545.80x = 610,135,680.12
  5. Step 5: Solve for x
    x = 610,135,680.12/21,545.80
  6. Step 6: Final answer
    x = 28,318.08

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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.