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Finding the Fourth Proportional to 820.18, 1,131.63 and 554.75

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Solution

The fourth proportional to 820.18, 1,131.63 and 554.75 is: 765.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.18 : 1,131.63 = 554.75 : x
  2. Step 2: Convert to fraction form
    820.18/1,131.63 = 554.75/x
  3. Step 3: Cross multiply
    820.18x = 1,131.63 × 554.75
  4. Step 4: Simplify right side
    820.18x = 627,768.25
  5. Step 5: Solve for x
    x = 627,768.25/820.18
  6. Step 6: Final answer
    x = 765.40

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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.