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Finding the Fourth Proportional to 15,545.46, 21,451.89 and 8,921.46

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Solution

The fourth proportional to 15,545.46, 21,451.89 and 8,921.46 is: 12,311.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,545.46 : 21,451.89 = 8,921.46 : x
  2. Step 2: Convert to fraction form
    15,545.46/21,451.89 = 8,921.46/x
  3. Step 3: Cross multiply
    15,545.46x = 21,451.89 × 8,921.46
  4. Step 4: Simplify right side
    15,545.46x = 191,382,178.56
  5. Step 5: Solve for x
    x = 191,382,178.56/15,545.46
  6. Step 6: Final answer
    x = 12,311.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.