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Finding the Fourth Proportional to 202.61, 304.05 and 105.20

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Solution

The fourth proportional to 202.61, 304.05 and 105.20 is: 157.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.61 : 304.05 = 105.20 : x
  2. Step 2: Convert to fraction form
    202.61/304.05 = 105.20/x
  3. Step 3: Cross multiply
    202.61x = 304.05 × 105.20
  4. Step 4: Simplify right side
    202.61x = 31,986.06
  5. Step 5: Solve for x
    x = 31,986.06/202.61
  6. Step 6: Final answer
    x = 157.87

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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.