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Finding the Fourth Proportional to 291.70, 402.56 and 160.72

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Solution

The fourth proportional to 291.70, 402.56 and 160.72 is: 221.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.70 : 402.56 = 160.72 : x
  2. Step 2: Convert to fraction form
    291.70/402.56 = 160.72/x
  3. Step 3: Cross multiply
    291.70x = 402.56 × 160.72
  4. Step 4: Simplify right side
    291.70x = 64,698.24
  5. Step 5: Solve for x
    x = 64,698.24/291.70
  6. Step 6: Final answer
    x = 221.80

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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.