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Finding the Fourth Proportional to 315.72, 473.42 and 153.21

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Solution

The fourth proportional to 315.72, 473.42 and 153.21 is: 229.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.72 : 473.42 = 153.21 : x
  2. Step 2: Convert to fraction form
    315.72/473.42 = 153.21/x
  3. Step 3: Cross multiply
    315.72x = 473.42 × 153.21
  4. Step 4: Simplify right side
    315.72x = 72,532.68
  5. Step 5: Solve for x
    x = 72,532.68/315.72
  6. Step 6: Final answer
    x = 229.74

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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.