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Finding the Fourth Proportional to 117.05, 161.51 and 72.77

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Solution

The fourth proportional to 117.05, 161.51 and 72.77 is: 100.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.05 : 161.51 = 72.77 : x
  2. Step 2: Convert to fraction form
    117.05/161.51 = 72.77/x
  3. Step 3: Cross multiply
    117.05x = 161.51 × 72.77
  4. Step 4: Simplify right side
    117.05x = 11,751.91
  5. Step 5: Solve for x
    x = 11,751.91/117.05
  6. Step 6: Final answer
    x = 100.41

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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.