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Finding the Fourth Proportional to 309.14, 425.84 and 215.72

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Solution

The fourth proportional to 309.14, 425.84 and 215.72 is: 297.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.14 : 425.84 = 215.72 : x
  2. Step 2: Convert to fraction form
    309.14/425.84 = 215.72/x
  3. Step 3: Cross multiply
    309.14x = 425.84 × 215.72
  4. Step 4: Simplify right side
    309.14x = 91,859.00
  5. Step 5: Solve for x
    x = 91,859.00/309.14
  6. Step 6: Final answer
    x = 297.15

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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.