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Finding the Fourth Proportional to 315.30, 472.13 and 218.10

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Solution

The fourth proportional to 315.30, 472.13 and 218.10 is: 326.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.30 : 472.13 = 218.10 : x
  2. Step 2: Convert to fraction form
    315.30/472.13 = 218.10/x
  3. Step 3: Cross multiply
    315.30x = 472.13 × 218.10
  4. Step 4: Simplify right side
    315.30x = 102,971.55
  5. Step 5: Solve for x
    x = 102,971.55/315.30
  6. Step 6: Final answer
    x = 326.58

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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.