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Finding the Fourth Proportional to 538.85, 743.60 and 317.76

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Solution

The fourth proportional to 538.85, 743.60 and 317.76 is: 438.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.85 : 743.60 = 317.76 : x
  2. Step 2: Convert to fraction form
    538.85/743.60 = 317.76/x
  3. Step 3: Cross multiply
    538.85x = 743.60 × 317.76
  4. Step 4: Simplify right side
    538.85x = 236,282.89
  5. Step 5: Solve for x
    x = 236,282.89/538.85
  6. Step 6: Final answer
    x = 438.49

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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.