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Finding the Fourth Proportional to 803, 1,108.31 and 551.27

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Solution

The fourth proportional to 803, 1,108.31 and 551.27 is: 760.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    803 : 1,108.31 = 551.27 : x
  2. Step 2: Convert to fraction form
    803/1,108.31 = 551.27/x
  3. Step 3: Cross multiply
    803x = 1,108.31 × 551.27
  4. Step 4: Simplify right side
    803x = 610,978.05
  5. Step 5: Solve for x
    x = 610,978.05/803
  6. Step 6: Final answer
    x = 760.87

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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.