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Finding the Fourth Proportional to 202.91, 280.05 and 153.71

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Solution

The fourth proportional to 202.91, 280.05 and 153.71 is: 212.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.91 : 280.05 = 153.71 : x
  2. Step 2: Convert to fraction form
    202.91/280.05 = 153.71/x
  3. Step 3: Cross multiply
    202.91x = 280.05 × 153.71
  4. Step 4: Simplify right side
    202.91x = 43,044.32
  5. Step 5: Solve for x
    x = 43,044.32/202.91
  6. Step 6: Final answer
    x = 212.14

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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.