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Finding the Fourth Proportional to 216.59, 298.89 and 123.30

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Solution

The fourth proportional to 216.59, 298.89 and 123.30 is: 170.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.59 : 298.89 = 123.30 : x
  2. Step 2: Convert to fraction form
    216.59/298.89 = 123.30/x
  3. Step 3: Cross multiply
    216.59x = 298.89 × 123.30
  4. Step 4: Simplify right side
    216.59x = 36,853.14
  5. Step 5: Solve for x
    x = 36,853.14/216.59
  6. Step 6: Final answer
    x = 170.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.