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Finding the Fourth Proportional to 843.20, 1,261.50 and 555.20

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Solution

The fourth proportional to 843.20, 1,261.50 and 555.20 is: 830.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.20 : 1,261.50 = 555.20 : x
  2. Step 2: Convert to fraction form
    843.20/1,261.50 = 555.20/x
  3. Step 3: Cross multiply
    843.20x = 1,261.50 × 555.20
  4. Step 4: Simplify right side
    843.20x = 700,384.80
  5. Step 5: Solve for x
    x = 700,384.80/843.20
  6. Step 6: Final answer
    x = 830.63

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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.