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Finding the Fourth Proportional to 315.78, 473.62 and 133.16

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Solution

The fourth proportional to 315.78, 473.62 and 133.16 is: 199.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.78 : 473.62 = 133.16 : x
  2. Step 2: Convert to fraction form
    315.78/473.62 = 133.16/x
  3. Step 3: Cross multiply
    315.78x = 473.62 × 133.16
  4. Step 4: Simplify right side
    315.78x = 63,067.24
  5. Step 5: Solve for x
    x = 63,067.24/315.78
  6. Step 6: Final answer
    x = 199.72

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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.