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Finding the Fourth Proportional to 502.74, 693.80 and 355.42

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Solution

The fourth proportional to 502.74, 693.80 and 355.42 is: 490.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    502.74 : 693.80 = 355.42 : x
  2. Step 2: Convert to fraction form
    502.74/693.80 = 355.42/x
  3. Step 3: Cross multiply
    502.74x = 693.80 × 355.42
  4. Step 4: Simplify right side
    502.74x = 246,590.40
  5. Step 5: Solve for x
    x = 246,590.40/502.74
  6. Step 6: Final answer
    x = 490.49

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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.