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Finding the Fourth Proportional to 553.05, 762.87 and 356.49

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Solution

The fourth proportional to 553.05, 762.87 and 356.49 is: 491.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.05 : 762.87 = 356.49 : x
  2. Step 2: Convert to fraction form
    553.05/762.87 = 356.49/x
  3. Step 3: Cross multiply
    553.05x = 762.87 × 356.49
  4. Step 4: Simplify right side
    553.05x = 271,955.53
  5. Step 5: Solve for x
    x = 271,955.53/553.05
  6. Step 6: Final answer
    x = 491.74

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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.