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Finding the Fourth Proportional to 574.50, 861.75 and 318

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Solution

The fourth proportional to 574.50, 861.75 and 318 is: 477

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.50 : 861.75 = 318 : x
  2. Step 2: Convert to fraction form
    574.50/861.75 = 318/x
  3. Step 3: Cross multiply
    574.50x = 861.75 × 318
  4. Step 4: Simplify right side
    574.50x = 274,036.50
  5. Step 5: Solve for x
    x = 274,036.50/574.50
  6. Step 6: Final answer
    x = 477

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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.