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Finding the Fourth Proportional to 1,087.68, 1,631.04 and 357

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Solution

The fourth proportional to 1,087.68, 1,631.04 and 357 is: 535.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.68 : 1,631.04 = 357 : x
  2. Step 2: Convert to fraction form
    1,087.68/1,631.04 = 357/x
  3. Step 3: Cross multiply
    1,087.68x = 1,631.04 × 357
  4. Step 4: Simplify right side
    1,087.68x = 582,281.28
  5. Step 5: Solve for x
    x = 582,281.28/1,087.68
  6. Step 6: Final answer
    x = 535.34

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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.