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Finding the Fourth Proportional to 863.74, 1,296.15 and 315.91

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Solution

The fourth proportional to 863.74, 1,296.15 and 315.91 is: 474.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.74 : 1,296.15 = 315.91 : x
  2. Step 2: Convert to fraction form
    863.74/1,296.15 = 315.91/x
  3. Step 3: Cross multiply
    863.74x = 1,296.15 × 315.91
  4. Step 4: Simplify right side
    863.74x = 409,466.75
  5. Step 5: Solve for x
    x = 409,466.75/863.74
  6. Step 6: Final answer
    x = 474.06

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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.