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Finding the Fourth Proportional to 160.71, 221.79 and 90.77

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Solution

The fourth proportional to 160.71, 221.79 and 90.77 is: 125.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.71 : 221.79 = 90.77 : x
  2. Step 2: Convert to fraction form
    160.71/221.79 = 90.77/x
  3. Step 3: Cross multiply
    160.71x = 221.79 × 90.77
  4. Step 4: Simplify right side
    160.71x = 20,130.77
  5. Step 5: Solve for x
    x = 20,130.77/160.71
  6. Step 6: Final answer
    x = 125.26

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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.