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Finding the Fourth Proportional to 551.31, 760.71 and 318.39

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Solution

The fourth proportional to 551.31, 760.71 and 318.39 is: 439.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.31 : 760.71 = 318.39 : x
  2. Step 2: Convert to fraction form
    551.31/760.71 = 318.39/x
  3. Step 3: Cross multiply
    551.31x = 760.71 × 318.39
  4. Step 4: Simplify right side
    551.31x = 242,202.46
  5. Step 5: Solve for x
    x = 242,202.46/551.31
  6. Step 6: Final answer
    x = 439.32

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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.