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Finding the Fourth Proportional to 553.27, 762.96 and 428.71

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Solution

The fourth proportional to 553.27, 762.96 and 428.71 is: 591.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.27 : 762.96 = 428.71 : x
  2. Step 2: Convert to fraction form
    553.27/762.96 = 428.71/x
  3. Step 3: Cross multiply
    553.27x = 762.96 × 428.71
  4. Step 4: Simplify right side
    553.27x = 327,088.58
  5. Step 5: Solve for x
    x = 327,088.58/553.27
  6. Step 6: Final answer
    x = 591.19

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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.