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Finding the Fourth Proportional to 812.97, 1,121.15 and 543.32

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Solution

The fourth proportional to 812.97, 1,121.15 and 543.32 is: 749.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.97 : 1,121.15 = 543.32 : x
  2. Step 2: Convert to fraction form
    812.97/1,121.15 = 543.32/x
  3. Step 3: Cross multiply
    812.97x = 1,121.15 × 543.32
  4. Step 4: Simplify right side
    812.97x = 609,137.61
  5. Step 5: Solve for x
    x = 609,137.61/812.97
  6. Step 6: Final answer
    x = 749.28

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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.