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Finding the Fourth Proportional to 553.72, 764.02 and 317.74

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Solution

The fourth proportional to 553.72, 764.02 and 317.74 is: 438.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.72 : 764.02 = 317.74 : x
  2. Step 2: Convert to fraction form
    553.72/764.02 = 317.74/x
  3. Step 3: Cross multiply
    553.72x = 764.02 × 317.74
  4. Step 4: Simplify right side
    553.72x = 242,759.71
  5. Step 5: Solve for x
    x = 242,759.71/553.72
  6. Step 6: Final answer
    x = 438.42

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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.