Home / 1,087.78-1,631.50-394.42

Finding the Fourth Proportional to 1,087.78, 1,631.50 and 394.42

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Solution

The fourth proportional to 1,087.78, 1,631.50 and 394.42 is: 591.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.78 : 1,631.50 = 394.42 : x
  2. Step 2: Convert to fraction form
    1,087.78/1,631.50 = 394.42/x
  3. Step 3: Cross multiply
    1,087.78x = 1,631.50 × 394.42
  4. Step 4: Simplify right side
    1,087.78x = 643,496.23
  5. Step 5: Solve for x
    x = 643,496.23/1,087.78
  6. Step 6: Final answer
    x = 591.57

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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.