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Finding the Fourth Proportional to 160.61, 221.63 and 90.66

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Solution

The fourth proportional to 160.61, 221.63 and 90.66 is: 125.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.61 : 221.63 = 90.66 : x
  2. Step 2: Convert to fraction form
    160.61/221.63 = 90.66/x
  3. Step 3: Cross multiply
    160.61x = 221.63 × 90.66
  4. Step 4: Simplify right side
    160.61x = 20,092.98
  5. Step 5: Solve for x
    x = 20,092.98/160.61
  6. Step 6: Final answer
    x = 125.10

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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.