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Finding the Fourth Proportional to 551.42, 760.88 and 318.50

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Solution

The fourth proportional to 551.42, 760.88 and 318.50 is: 439.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.42 : 760.88 = 318.50 : x
  2. Step 2: Convert to fraction form
    551.42/760.88 = 318.50/x
  3. Step 3: Cross multiply
    551.42x = 760.88 × 318.50
  4. Step 4: Simplify right side
    551.42x = 242,338.69
  5. Step 5: Solve for x
    x = 242,338.69/551.42
  6. Step 6: Final answer
    x = 439.48

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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.