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Finding the Fourth Proportional to 539.30, 744.12 and 318.21

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Solution

The fourth proportional to 539.30, 744.12 and 318.21 is: 439.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.30 : 744.12 = 318.21 : x
  2. Step 2: Convert to fraction form
    539.30/744.12 = 318.21/x
  3. Step 3: Cross multiply
    539.30x = 744.12 × 318.21
  4. Step 4: Simplify right side
    539.30x = 236,786.43
  5. Step 5: Solve for x
    x = 236,786.43/539.30
  6. Step 6: Final answer
    x = 439.07

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1.5x scale

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.