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Finding the Fourth Proportional to 807.96, 1,211.70 and 515.03

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Solution

The fourth proportional to 807.96, 1,211.70 and 515.03 is: 772.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.96 : 1,211.70 = 515.03 : x
  2. Step 2: Convert to fraction form
    807.96/1,211.70 = 515.03/x
  3. Step 3: Cross multiply
    807.96x = 1,211.70 × 515.03
  4. Step 4: Simplify right side
    807.96x = 624,061.85
  5. Step 5: Solve for x
    x = 624,061.85/807.96
  6. Step 6: Final answer
    x = 772.39

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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.