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Finding the Fourth Proportional to 808.87, 1,213.04 and 315.24

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Solution

The fourth proportional to 808.87, 1,213.04 and 315.24 is: 472.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.87 : 1,213.04 = 315.24 : x
  2. Step 2: Convert to fraction form
    808.87/1,213.04 = 315.24/x
  3. Step 3: Cross multiply
    808.87x = 1,213.04 × 315.24
  4. Step 4: Simplify right side
    808.87x = 382,400.46
  5. Step 5: Solve for x
    x = 382,400.46/808.87
  6. Step 6: Final answer
    x = 472.76

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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.