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Finding the Fourth Proportional to 808.32, 1,213.10 and 418.65

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Solution

The fourth proportional to 808.32, 1,213.10 and 418.65 is: 628.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.32 : 1,213.10 = 418.65 : x
  2. Step 2: Convert to fraction form
    808.32/1,213.10 = 418.65/x
  3. Step 3: Cross multiply
    808.32x = 1,213.10 × 418.65
  4. Step 4: Simplify right side
    808.32x = 507,864.32
  5. Step 5: Solve for x
    x = 507,864.32/808.32
  6. Step 6: Final answer
    x = 628.30

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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.