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Finding the Fourth Proportional to 210.42, 315.73 and 85.33

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Solution

The fourth proportional to 210.42, 315.73 and 85.33 is: 128.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.42 : 315.73 = 85.33 : x
  2. Step 2: Convert to fraction form
    210.42/315.73 = 85.33/x
  3. Step 3: Cross multiply
    210.42x = 315.73 × 85.33
  4. Step 4: Simplify right side
    210.42x = 26,942.33
  5. Step 5: Solve for x
    x = 26,942.33/210.42
  6. Step 6: Final answer
    x = 128.04

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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.