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Finding the Fourth Proportional to 538.70, 743.47 and 305.87

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Solution

The fourth proportional to 538.70, 743.47 and 305.87 is: 422.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.70 : 743.47 = 305.87 : x
  2. Step 2: Convert to fraction form
    538.70/743.47 = 305.87/x
  3. Step 3: Cross multiply
    538.70x = 743.47 × 305.87
  4. Step 4: Simplify right side
    538.70x = 227,400.69
  5. Step 5: Solve for x
    x = 227,400.69/538.70
  6. Step 6: Final answer
    x = 422.13

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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.