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Finding the Fourth Proportional to 865.05, 1,296.80 and 316.86

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Solution

The fourth proportional to 865.05, 1,296.80 and 316.86 is: 475.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.05 : 1,296.80 = 316.86 : x
  2. Step 2: Convert to fraction form
    865.05/1,296.80 = 316.86/x
  3. Step 3: Cross multiply
    865.05x = 1,296.80 × 316.86
  4. Step 4: Simplify right side
    865.05x = 410,895.98
  5. Step 5: Solve for x
    x = 410,895.98/865.05
  6. Step 6: Final answer
    x = 475.00

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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.