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Finding the Fourth Proportional to 1,087.43, 1,631.34 and 357

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Solution

The fourth proportional to 1,087.43, 1,631.34 and 357 is: 535.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.43 : 1,631.34 = 357 : x
  2. Step 2: Convert to fraction form
    1,087.43/1,631.34 = 357/x
  3. Step 3: Cross multiply
    1,087.43x = 1,631.34 × 357
  4. Step 4: Simplify right side
    1,087.43x = 582,388.38
  5. Step 5: Solve for x
    x = 582,388.38/1,087.43
  6. Step 6: Final answer
    x = 535.57

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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.