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Finding the Fourth Proportional to 315.18, 434.70 and 216.90

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Solution

The fourth proportional to 315.18, 434.70 and 216.90 is: 299.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.18 : 434.70 = 216.90 : x
  2. Step 2: Convert to fraction form
    315.18/434.70 = 216.90/x
  3. Step 3: Cross multiply
    315.18x = 434.70 × 216.90
  4. Step 4: Simplify right side
    315.18x = 94,286.43
  5. Step 5: Solve for x
    x = 94,286.43/315.18
  6. Step 6: Final answer
    x = 299.15

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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.