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Finding the Fourth Proportional to 1,083.31, 1,624.97 and 389.95

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Solution

The fourth proportional to 1,083.31, 1,624.97 and 389.95 is: 584.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,083.31 : 1,624.97 = 389.95 : x
  2. Step 2: Convert to fraction form
    1,083.31/1,624.97 = 389.95/x
  3. Step 3: Cross multiply
    1,083.31x = 1,624.97 × 389.95
  4. Step 4: Simplify right side
    1,083.31x = 633,653.96
  5. Step 5: Solve for x
    x = 633,653.96/1,083.31
  6. Step 6: Final answer
    x = 584.93

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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.