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Finding the Fourth Proportional to 553.70, 764.17 and 317.72

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Solution

The fourth proportional to 553.70, 764.17 and 317.72 is: 438.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.70 : 764.17 = 317.72 : x
  2. Step 2: Convert to fraction form
    553.70/764.17 = 317.72/x
  3. Step 3: Cross multiply
    553.70x = 764.17 × 317.72
  4. Step 4: Simplify right side
    553.70x = 242,792.09
  5. Step 5: Solve for x
    x = 242,792.09/553.70
  6. Step 6: Final answer
    x = 438.49

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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.