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Finding the Fourth Proportional to 291.45, 402.21 and 160.47

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Solution

The fourth proportional to 291.45, 402.21 and 160.47 is: 221.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.45 : 402.21 = 160.47 : x
  2. Step 2: Convert to fraction form
    291.45/402.21 = 160.47/x
  3. Step 3: Cross multiply
    291.45x = 402.21 × 160.47
  4. Step 4: Simplify right side
    291.45x = 64,542.64
  5. Step 5: Solve for x
    x = 64,542.64/291.45
  6. Step 6: Final answer
    x = 221.45

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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.