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Finding the Fourth Proportional to 502.21, 694.07 and 391.57

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Solution

The fourth proportional to 502.21, 694.07 and 391.57 is: 541.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    502.21 : 694.07 = 391.57 : x
  2. Step 2: Convert to fraction form
    502.21/694.07 = 391.57/x
  3. Step 3: Cross multiply
    502.21x = 694.07 × 391.57
  4. Step 4: Simplify right side
    502.21x = 271,775.03
  5. Step 5: Solve for x
    x = 271,775.03/502.21
  6. Step 6: Final answer
    x = 541.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.