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Finding the Fourth Proportional to 289.76, 399.90 and 171.77

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Solution

The fourth proportional to 289.76, 399.90 and 171.77 is: 237.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.76 : 399.90 = 171.77 : x
  2. Step 2: Convert to fraction form
    289.76/399.90 = 171.77/x
  3. Step 3: Cross multiply
    289.76x = 399.90 × 171.77
  4. Step 4: Simplify right side
    289.76x = 68,689.96
  5. Step 5: Solve for x
    x = 68,689.96/289.76
  6. Step 6: Final answer
    x = 237.06

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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.