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Finding the Fourth Proportional to 551.49, 761.04 and 318.62

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Solution

The fourth proportional to 551.49, 761.04 and 318.62 is: 439.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.49 : 761.04 = 318.62 : x
  2. Step 2: Convert to fraction form
    551.49/761.04 = 318.62/x
  3. Step 3: Cross multiply
    551.49x = 761.04 × 318.62
  4. Step 4: Simplify right side
    551.49x = 242,478.76
  5. Step 5: Solve for x
    x = 242,478.76/551.49
  6. Step 6: Final answer
    x = 439.68

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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.