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Finding the Fourth Proportional to 160.40, 221.64 and 155.12

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Solution

The fourth proportional to 160.40, 221.64 and 155.12 is: 214.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.40 : 221.64 = 155.12 : x
  2. Step 2: Convert to fraction form
    160.40/221.64 = 155.12/x
  3. Step 3: Cross multiply
    160.40x = 221.64 × 155.12
  4. Step 4: Simplify right side
    160.40x = 34,380.80
  5. Step 5: Solve for x
    x = 34,380.80/160.40
  6. Step 6: Final answer
    x = 214.34

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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.