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Finding the Fourth Proportional to 210.56, 315.99 and 123.84

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Solution

The fourth proportional to 210.56, 315.99 and 123.84 is: 185.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.56 : 315.99 = 123.84 : x
  2. Step 2: Convert to fraction form
    210.56/315.99 = 123.84/x
  3. Step 3: Cross multiply
    210.56x = 315.99 × 123.84
  4. Step 4: Simplify right side
    210.56x = 39,132.20
  5. Step 5: Solve for x
    x = 39,132.20/210.56
  6. Step 6: Final answer
    x = 185.85

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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.