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Finding the Fourth Proportional to 849.12, 1,171.68 and 538.80

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Solution

The fourth proportional to 849.12, 1,171.68 and 538.80 is: 743.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.12 : 1,171.68 = 538.80 : x
  2. Step 2: Convert to fraction form
    849.12/1,171.68 = 538.80/x
  3. Step 3: Cross multiply
    849.12x = 1,171.68 × 538.80
  4. Step 4: Simplify right side
    849.12x = 631,301.18
  5. Step 5: Solve for x
    x = 631,301.18/849.12
  6. Step 6: Final answer
    x = 743.48

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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.