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Finding the Fourth Proportional to 815.84, 1,126.78 and 553.40

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Solution

The fourth proportional to 815.84, 1,126.78 and 553.40 is: 764.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.84 : 1,126.78 = 553.40 : x
  2. Step 2: Convert to fraction form
    815.84/1,126.78 = 553.40/x
  3. Step 3: Cross multiply
    815.84x = 1,126.78 × 553.40
  4. Step 4: Simplify right side
    815.84x = 623,560.05
  5. Step 5: Solve for x
    x = 623,560.05/815.84
  6. Step 6: Final answer
    x = 764.32

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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.