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Finding the Fourth Proportional to 539.40, 744.30 and 315.30

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Solution

The fourth proportional to 539.40, 744.30 and 315.30 is: 435.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.40 : 744.30 = 315.30 : x
  2. Step 2: Convert to fraction form
    539.40/744.30 = 315.30/x
  3. Step 3: Cross multiply
    539.40x = 744.30 × 315.30
  4. Step 4: Simplify right side
    539.40x = 234,677.79
  5. Step 5: Solve for x
    x = 234,677.79/539.40
  6. Step 6: Final answer
    x = 435.07

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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.