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Finding the Fourth Proportional to 807.55, 1,213.36 and 515.18

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Solution

The fourth proportional to 807.55, 1,213.36 and 515.18 is: 774.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.55 : 1,213.36 = 515.18 : x
  2. Step 2: Convert to fraction form
    807.55/1,213.36 = 515.18/x
  3. Step 3: Cross multiply
    807.55x = 1,213.36 × 515.18
  4. Step 4: Simplify right side
    807.55x = 625,100.55
  5. Step 5: Solve for x
    x = 625,100.55/807.55
  6. Step 6: Final answer
    x = 774.07

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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.