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Finding the Fourth Proportional to 315.75, 473.85 and 123.42

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Solution

The fourth proportional to 315.75, 473.85 and 123.42 is: 185.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.75 : 473.85 = 123.42 : x
  2. Step 2: Convert to fraction form
    315.75/473.85 = 123.42/x
  3. Step 3: Cross multiply
    315.75x = 473.85 × 123.42
  4. Step 4: Simplify right side
    315.75x = 58,482.57
  5. Step 5: Solve for x
    x = 58,482.57/315.75
  6. Step 6: Final answer
    x = 185.22

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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.