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Finding the Fourth Proportional to 210.56, 315.98 and 66.38

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Solution

The fourth proportional to 210.56, 315.98 and 66.38 is: 99.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.56 : 315.98 = 66.38 : x
  2. Step 2: Convert to fraction form
    210.56/315.98 = 66.38/x
  3. Step 3: Cross multiply
    210.56x = 315.98 × 66.38
  4. Step 4: Simplify right side
    210.56x = 20,974.42
  5. Step 5: Solve for x
    x = 20,974.42/210.56
  6. Step 6: Final answer
    x = 99.61

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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.