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Finding the Fourth Proportional to 315.55, 472.50 and 218.35

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Solution

The fourth proportional to 315.55, 472.50 and 218.35 is: 326.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.55 : 472.50 = 218.35 : x
  2. Step 2: Convert to fraction form
    315.55/472.50 = 218.35/x
  3. Step 3: Cross multiply
    315.55x = 472.50 × 218.35
  4. Step 4: Simplify right side
    315.55x = 103,170.38
  5. Step 5: Solve for x
    x = 103,170.38/315.55
  6. Step 6: Final answer
    x = 326.95

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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.