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Finding the Fourth Proportional to 1,640.99, 2,461.53 and 408.35

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Solution

The fourth proportional to 1,640.99, 2,461.53 and 408.35 is: 612.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640.99 : 2,461.53 = 408.35 : x
  2. Step 2: Convert to fraction form
    1,640.99/2,461.53 = 408.35/x
  3. Step 3: Cross multiply
    1,640.99x = 2,461.53 × 408.35
  4. Step 4: Simplify right side
    1,640.99x = 1,005,165.78
  5. Step 5: Solve for x
    x = 1,005,165.78/1,640.99
  6. Step 6: Final answer
    x = 612.54

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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.