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Finding the Fourth Proportional to 817.14, 1,126.62 and 554.70

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Solution

The fourth proportional to 817.14, 1,126.62 and 554.70 is: 764.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.14 : 1,126.62 = 554.70 : x
  2. Step 2: Convert to fraction form
    817.14/1,126.62 = 554.70/x
  3. Step 3: Cross multiply
    817.14x = 1,126.62 × 554.70
  4. Step 4: Simplify right side
    817.14x = 624,936.11
  5. Step 5: Solve for x
    x = 624,936.11/817.14
  6. Step 6: Final answer
    x = 764.78

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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.