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Finding the Fourth Proportional to 554.70, 765.55 and 318.72

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Solution

The fourth proportional to 554.70, 765.55 and 318.72 is: 439.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.70 : 765.55 = 318.72 : x
  2. Step 2: Convert to fraction form
    554.70/765.55 = 318.72/x
  3. Step 3: Cross multiply
    554.70x = 765.55 × 318.72
  4. Step 4: Simplify right side
    554.70x = 243,996.10
  5. Step 5: Solve for x
    x = 243,996.10/554.70
  6. Step 6: Final answer
    x = 439.87

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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.