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Finding the Fourth Proportional to 551.71, 761.34 and 318.79

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Solution

The fourth proportional to 551.71, 761.34 and 318.79 is: 439.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.71 : 761.34 = 318.79 : x
  2. Step 2: Convert to fraction form
    551.71/761.34 = 318.79/x
  3. Step 3: Cross multiply
    551.71x = 761.34 × 318.79
  4. Step 4: Simplify right side
    551.71x = 242,707.58
  5. Step 5: Solve for x
    x = 242,707.58/551.71
  6. Step 6: Final answer
    x = 439.92

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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.