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Finding the Fourth Proportional to 210.05, 315.26 and 100.43

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Solution

The fourth proportional to 210.05, 315.26 and 100.43 is: 150.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.05 : 315.26 = 100.43 : x
  2. Step 2: Convert to fraction form
    210.05/315.26 = 100.43/x
  3. Step 3: Cross multiply
    210.05x = 315.26 × 100.43
  4. Step 4: Simplify right side
    210.05x = 31,661.56
  5. Step 5: Solve for x
    x = 31,661.56/210.05
  6. Step 6: Final answer
    x = 150.73

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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.