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Finding the Fourth Proportional to 1,641.23, 2,461.79 and 408.61

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Solution

The fourth proportional to 1,641.23, 2,461.79 and 408.61 is: 612.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,641.23 : 2,461.79 = 408.61 : x
  2. Step 2: Convert to fraction form
    1,641.23/2,461.79 = 408.61/x
  3. Step 3: Cross multiply
    1,641.23x = 2,461.79 × 408.61
  4. Step 4: Simplify right side
    1,641.23x = 1,005,916.11
  5. Step 5: Solve for x
    x = 1,005,916.11/1,641.23
  6. Step 6: Final answer
    x = 612.90

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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.