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Finding the Fourth Proportional to 210.11, 315.39 and 123.54

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Solution

The fourth proportional to 210.11, 315.39 and 123.54 is: 185.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.11 : 315.39 = 123.54 : x
  2. Step 2: Convert to fraction form
    210.11/315.39 = 123.54/x
  3. Step 3: Cross multiply
    210.11x = 315.39 × 123.54
  4. Step 4: Simplify right side
    210.11x = 38,963.28
  5. Step 5: Solve for x
    x = 38,963.28/210.11
  6. Step 6: Final answer
    x = 185.45

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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.