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Finding the Fourth Proportional to 538.99, 743.90 and 318.06

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Solution

The fourth proportional to 538.99, 743.90 and 318.06 is: 438.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.99 : 743.90 = 318.06 : x
  2. Step 2: Convert to fraction form
    538.99/743.90 = 318.06/x
  3. Step 3: Cross multiply
    538.99x = 743.90 × 318.06
  4. Step 4: Simplify right side
    538.99x = 236,604.83
  5. Step 5: Solve for x
    x = 236,604.83/538.99
  6. Step 6: Final answer
    x = 438.98

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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.