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Finding the Fourth Proportional to 538.64, 743.52 and 317.72

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Solution

The fourth proportional to 538.64, 743.52 and 317.72 is: 438.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.64 : 743.52 = 317.72 : x
  2. Step 2: Convert to fraction form
    538.64/743.52 = 317.72/x
  3. Step 3: Cross multiply
    538.64x = 743.52 × 317.72
  4. Step 4: Simplify right side
    538.64x = 236,231.17
  5. Step 5: Solve for x
    x = 236,231.17/538.64
  6. Step 6: Final answer
    x = 438.57

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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.