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Finding the Fourth Proportional to 1,083.40, 1,624.95 and 389.97

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Solution

The fourth proportional to 1,083.40, 1,624.95 and 389.97 is: 584.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,083.40 : 1,624.95 = 389.97 : x
  2. Step 2: Convert to fraction form
    1,083.40/1,624.95 = 389.97/x
  3. Step 3: Cross multiply
    1,083.40x = 1,624.95 × 389.97
  4. Step 4: Simplify right side
    1,083.40x = 633,687.42
  5. Step 5: Solve for x
    x = 633,687.42/1,083.40
  6. Step 6: Final answer
    x = 584.91

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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.