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Finding the Fourth Proportional to 551.52, 760.80 and 318.56

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Solution

The fourth proportional to 551.52, 760.80 and 318.56 is: 439.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.52 : 760.80 = 318.56 : x
  2. Step 2: Convert to fraction form
    551.52/760.80 = 318.56/x
  3. Step 3: Cross multiply
    551.52x = 760.80 × 318.56
  4. Step 4: Simplify right side
    551.52x = 242,360.45
  5. Step 5: Solve for x
    x = 242,360.45/551.52
  6. Step 6: Final answer
    x = 439.44

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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.