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Finding the Fourth Proportional to 553.70, 763.70 and 428.96

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Solution

The fourth proportional to 553.70, 763.70 and 428.96 is: 591.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.70 : 763.70 = 428.96 : x
  2. Step 2: Convert to fraction form
    553.70/763.70 = 428.96/x
  3. Step 3: Cross multiply
    553.70x = 763.70 × 428.96
  4. Step 4: Simplify right side
    553.70x = 327,596.52
  5. Step 5: Solve for x
    x = 327,596.52/553.70
  6. Step 6: Final answer
    x = 591.65

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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.