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Finding the Fourth Proportional to 551.09, 760.50 and 318.21

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Solution

The fourth proportional to 551.09, 760.50 and 318.21 is: 439.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.09 : 760.50 = 318.21 : x
  2. Step 2: Convert to fraction form
    551.09/760.50 = 318.21/x
  3. Step 3: Cross multiply
    551.09x = 760.50 × 318.21
  4. Step 4: Simplify right side
    551.09x = 241,998.71
  5. Step 5: Solve for x
    x = 241,998.71/551.09
  6. Step 6: Final answer
    x = 439.13

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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.