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Finding the Fourth Proportional to 315.17, 472.70 and 109.72

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Solution

The fourth proportional to 315.17, 472.70 and 109.72 is: 164.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.17 : 472.70 = 109.72 : x
  2. Step 2: Convert to fraction form
    315.17/472.70 = 109.72/x
  3. Step 3: Cross multiply
    315.17x = 472.70 × 109.72
  4. Step 4: Simplify right side
    315.17x = 51,863.74
  5. Step 5: Solve for x
    x = 51,863.74/315.17
  6. Step 6: Final answer
    x = 164.56

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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.