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Finding the Fourth Proportional to 553.85, 764.21 and 317.76

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Solution

The fourth proportional to 553.85, 764.21 and 317.76 is: 438.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.85 : 764.21 = 317.76 : x
  2. Step 2: Convert to fraction form
    553.85/764.21 = 317.76/x
  3. Step 3: Cross multiply
    553.85x = 764.21 × 317.76
  4. Step 4: Simplify right side
    553.85x = 242,835.37
  5. Step 5: Solve for x
    x = 242,835.37/553.85
  6. Step 6: Final answer
    x = 438.45

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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.