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Finding the Fourth Proportional to 309.40, 425.99 and 270.59

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Solution

The fourth proportional to 309.40, 425.99 and 270.59 is: 372.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.40 : 425.99 = 270.59 : x
  2. Step 2: Convert to fraction form
    309.40/425.99 = 270.59/x
  3. Step 3: Cross multiply
    309.40x = 425.99 × 270.59
  4. Step 4: Simplify right side
    309.40x = 115,267.18
  5. Step 5: Solve for x
    x = 115,267.18/309.40
  6. Step 6: Final answer
    x = 372.55

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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.