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Finding the Fourth Proportional to 807.32, 1,211.70 and 551

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Solution

The fourth proportional to 807.32, 1,211.70 and 551 is: 826.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.32 : 1,211.70 = 551 : x
  2. Step 2: Convert to fraction form
    807.32/1,211.70 = 551/x
  3. Step 3: Cross multiply
    807.32x = 1,211.70 × 551
  4. Step 4: Simplify right side
    807.32x = 667,646.70
  5. Step 5: Solve for x
    x = 667,646.70/807.32
  6. Step 6: Final answer
    x = 826.99

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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.