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Finding the Fourth Proportional to 315.34, 472.94 and 148.56

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Solution

The fourth proportional to 315.34, 472.94 and 148.56 is: 222.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.34 : 472.94 = 148.56 : x
  2. Step 2: Convert to fraction form
    315.34/472.94 = 148.56/x
  3. Step 3: Cross multiply
    315.34x = 472.94 × 148.56
  4. Step 4: Simplify right side
    315.34x = 70,259.97
  5. Step 5: Solve for x
    x = 70,259.97/315.34
  6. Step 6: Final answer
    x = 222.81

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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.