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Finding the Fourth Proportional to 1,381.83, 2,073.03 and 408

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Solution

The fourth proportional to 1,381.83, 2,073.03 and 408 is: 612.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.83 : 2,073.03 = 408 : x
  2. Step 2: Convert to fraction form
    1,381.83/2,073.03 = 408/x
  3. Step 3: Cross multiply
    1,381.83x = 2,073.03 × 408
  4. Step 4: Simplify right side
    1,381.83x = 845,796.24
  5. Step 5: Solve for x
    x = 845,796.24/1,381.83
  6. Step 6: Final answer
    x = 612.08

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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.