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Finding the Fourth Proportional to 554.28, 764.85 and 318.22

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Solution

The fourth proportional to 554.28, 764.85 and 318.22 is: 439.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.28 : 764.85 = 318.22 : x
  2. Step 2: Convert to fraction form
    554.28/764.85 = 318.22/x
  3. Step 3: Cross multiply
    554.28x = 764.85 × 318.22
  4. Step 4: Simplify right side
    554.28x = 243,389.85
  5. Step 5: Solve for x
    x = 243,389.85/554.28
  6. Step 6: Final answer
    x = 439.11

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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.