Home / 1,087.90-1,631.94-394.54

Finding the Fourth Proportional to 1,087.90, 1,631.94 and 394.54

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Solution

The fourth proportional to 1,087.90, 1,631.94 and 394.54 is: 591.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.90 : 1,631.94 = 394.54 : x
  2. Step 2: Convert to fraction form
    1,087.90/1,631.94 = 394.54/x
  3. Step 3: Cross multiply
    1,087.90x = 1,631.94 × 394.54
  4. Step 4: Simplify right side
    1,087.90x = 643,865.61
  5. Step 5: Solve for x
    x = 643,865.61/1,087.90
  6. Step 6: Final answer
    x = 591.84

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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.