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Finding the Fourth Proportional to 849.78, 1,172.18 and 539.28

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Solution

The fourth proportional to 849.78, 1,172.18 and 539.28 is: 743.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.78 : 1,172.18 = 539.28 : x
  2. Step 2: Convert to fraction form
    849.78/1,172.18 = 539.28/x
  3. Step 3: Cross multiply
    849.78x = 1,172.18 × 539.28
  4. Step 4: Simplify right side
    849.78x = 632,133.23
  5. Step 5: Solve for x
    x = 632,133.23/849.78
  6. Step 6: Final answer
    x = 743.88

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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.