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Finding the Fourth Proportional to 315.49, 472.79 and 142.10

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Solution

The fourth proportional to 315.49, 472.79 and 142.10 is: 212.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.49 : 472.79 = 142.10 : x
  2. Step 2: Convert to fraction form
    315.49/472.79 = 142.10/x
  3. Step 3: Cross multiply
    315.49x = 472.79 × 142.10
  4. Step 4: Simplify right side
    315.49x = 67,183.46
  5. Step 5: Solve for x
    x = 67,183.46/315.49
  6. Step 6: Final answer
    x = 212.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.