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Finding the Fourth Proportional to 315.09, 434.36 and 216.68

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Solution

The fourth proportional to 315.09, 434.36 and 216.68 is: 298.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.09 : 434.36 = 216.68 : x
  2. Step 2: Convert to fraction form
    315.09/434.36 = 216.68/x
  3. Step 3: Cross multiply
    315.09x = 434.36 × 216.68
  4. Step 4: Simplify right side
    315.09x = 94,115.49
  5. Step 5: Solve for x
    x = 94,115.49/315.09
  6. Step 6: Final answer
    x = 298.69

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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.