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Finding the Fourth Proportional to 502.10, 692.86 and 281

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Solution

The fourth proportional to 502.10, 692.86 and 281 is: 387.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    502.10 : 692.86 = 281 : x
  2. Step 2: Convert to fraction form
    502.10/692.86 = 281/x
  3. Step 3: Cross multiply
    502.10x = 692.86 × 281
  4. Step 4: Simplify right side
    502.10x = 194,693.66
  5. Step 5: Solve for x
    x = 194,693.66/502.10
  6. Step 6: Final answer
    x = 387.76

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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.