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Finding the Fourth Proportional to 315.30, 434.62 and 216.74

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Solution

The fourth proportional to 315.30, 434.62 and 216.74 is: 298.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.30 : 434.62 = 216.74 : x
  2. Step 2: Convert to fraction form
    315.30/434.62 = 216.74/x
  3. Step 3: Cross multiply
    315.30x = 434.62 × 216.74
  4. Step 4: Simplify right side
    315.30x = 94,199.54
  5. Step 5: Solve for x
    x = 94,199.54/315.30
  6. Step 6: Final answer
    x = 298.76

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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.