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Finding the Fourth Proportional to 538.95, 743.76 and 317.88

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Solution

The fourth proportional to 538.95, 743.76 and 317.88 is: 438.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.95 : 743.76 = 317.88 : x
  2. Step 2: Convert to fraction form
    538.95/743.76 = 317.88/x
  3. Step 3: Cross multiply
    538.95x = 743.76 × 317.88
  4. Step 4: Simplify right side
    538.95x = 236,426.43
  5. Step 5: Solve for x
    x = 236,426.43/538.95
  6. Step 6: Final answer
    x = 438.68

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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.