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Finding the Fourth Proportional to 816.72, 1,125.78 and 554.28

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Solution

The fourth proportional to 816.72, 1,125.78 and 554.28 is: 764.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.72 : 1,125.78 = 554.28 : x
  2. Step 2: Convert to fraction form
    816.72/1,125.78 = 554.28/x
  3. Step 3: Cross multiply
    816.72x = 1,125.78 × 554.28
  4. Step 4: Simplify right side
    816.72x = 623,997.34
  5. Step 5: Solve for x
    x = 623,997.34/816.72
  6. Step 6: Final answer
    x = 764.03

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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.