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Finding the Fourth Proportional to 538.09, 742.70 and 317.11

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Solution

The fourth proportional to 538.09, 742.70 and 317.11 is: 437.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.09 : 742.70 = 317.11 : x
  2. Step 2: Convert to fraction form
    538.09/742.70 = 317.11/x
  3. Step 3: Cross multiply
    538.09x = 742.70 × 317.11
  4. Step 4: Simplify right side
    538.09x = 235,517.93
  5. Step 5: Solve for x
    x = 235,517.93/538.09
  6. Step 6: Final answer
    x = 437.69

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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.