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Finding the Fourth Proportional to 315.42, 473.12 and 153.21

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Solution

The fourth proportional to 315.42, 473.12 and 153.21 is: 229.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.42 : 473.12 = 153.21 : x
  2. Step 2: Convert to fraction form
    315.42/473.12 = 153.21/x
  3. Step 3: Cross multiply
    315.42x = 473.12 × 153.21
  4. Step 4: Simplify right side
    315.42x = 72,486.72
  5. Step 5: Solve for x
    x = 72,486.72/315.42
  6. Step 6: Final answer
    x = 229.81

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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.