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Finding the Fourth Proportional to 808.12, 1,115.50 and 513.80

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Solution

The fourth proportional to 808.12, 1,115.50 and 513.80 is: 709.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.12 : 1,115.50 = 513.80 : x
  2. Step 2: Convert to fraction form
    808.12/1,115.50 = 513.80/x
  3. Step 3: Cross multiply
    808.12x = 1,115.50 × 513.80
  4. Step 4: Simplify right side
    808.12x = 573,143.90
  5. Step 5: Solve for x
    x = 573,143.90/808.12
  6. Step 6: Final answer
    x = 709.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.