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Finding the Fourth Proportional to 117.09, 161.63 and 73.45

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Solution

The fourth proportional to 117.09, 161.63 and 73.45 is: 101.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.09 : 161.63 = 73.45 : x
  2. Step 2: Convert to fraction form
    117.09/161.63 = 73.45/x
  3. Step 3: Cross multiply
    117.09x = 161.63 × 73.45
  4. Step 4: Simplify right side
    117.09x = 11,871.72
  5. Step 5: Solve for x
    x = 11,871.72/117.09
  6. Step 6: Final answer
    x = 101.39

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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.