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Finding the Fourth Proportional to 160.67, 221.70 and 90.72

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Solution

The fourth proportional to 160.67, 221.70 and 90.72 is: 125.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.67 : 221.70 = 90.72 : x
  2. Step 2: Convert to fraction form
    160.67/221.70 = 90.72/x
  3. Step 3: Cross multiply
    160.67x = 221.70 × 90.72
  4. Step 4: Simplify right side
    160.67x = 20,111.52
  5. Step 5: Solve for x
    x = 20,111.52/160.67
  6. Step 6: Final answer
    x = 125.17

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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.