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Finding the Fourth Proportional to 309.05, 425.77 and 215.63

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Solution

The fourth proportional to 309.05, 425.77 and 215.63 is: 297.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.05 : 425.77 = 215.63 : x
  2. Step 2: Convert to fraction form
    309.05/425.77 = 215.63/x
  3. Step 3: Cross multiply
    309.05x = 425.77 × 215.63
  4. Step 4: Simplify right side
    309.05x = 91,809.52
  5. Step 5: Solve for x
    x = 91,809.52/309.05
  6. Step 6: Final answer
    x = 297.07

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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.