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Finding the Fourth Proportional to 551.13, 760.69 and 318.39

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Solution

The fourth proportional to 551.13, 760.69 and 318.39 is: 439.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.13 : 760.69 = 318.39 : x
  2. Step 2: Convert to fraction form
    551.13/760.69 = 318.39/x
  3. Step 3: Cross multiply
    551.13x = 760.69 × 318.39
  4. Step 4: Simplify right side
    551.13x = 242,192.29
  5. Step 5: Solve for x
    x = 242,192.29/551.13
  6. Step 6: Final answer
    x = 439.45

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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.