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Finding the Fourth Proportional to 210.30, 315.53 and 107.61

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Solution

The fourth proportional to 210.30, 315.53 and 107.61 is: 161.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.30 : 315.53 = 107.61 : x
  2. Step 2: Convert to fraction form
    210.30/315.53 = 107.61/x
  3. Step 3: Cross multiply
    210.30x = 315.53 × 107.61
  4. Step 4: Simplify right side
    210.30x = 33,952.87
  5. Step 5: Solve for x
    x = 33,952.87/210.30
  6. Step 6: Final answer
    x = 161.45

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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.