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Finding the Fourth Proportional to 117.04, 161.41 and 90.73

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Solution

The fourth proportional to 117.04, 161.41 and 90.73 is: 125.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.04 : 161.41 = 90.73 : x
  2. Step 2: Convert to fraction form
    117.04/161.41 = 90.73/x
  3. Step 3: Cross multiply
    117.04x = 161.41 × 90.73
  4. Step 4: Simplify right side
    117.04x = 14,644.73
  5. Step 5: Solve for x
    x = 14,644.73/117.04
  6. Step 6: Final answer
    x = 125.13

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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.