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Finding the Fourth Proportional to 551.58, 760.92 and 318.57

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Solution

The fourth proportional to 551.58, 760.92 and 318.57 is: 439.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.58 : 760.92 = 318.57 : x
  2. Step 2: Convert to fraction form
    551.58/760.92 = 318.57/x
  3. Step 3: Cross multiply
    551.58x = 760.92 × 318.57
  4. Step 4: Simplify right side
    551.58x = 242,406.28
  5. Step 5: Solve for x
    x = 242,406.28/551.58
  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.