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Finding the Fourth Proportional to 118.61, 177.57 and 72.81

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Solution

The fourth proportional to 118.61, 177.57 and 72.81 is: 109.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.61 : 177.57 = 72.81 : x
  2. Step 2: Convert to fraction form
    118.61/177.57 = 72.81/x
  3. Step 3: Cross multiply
    118.61x = 177.57 × 72.81
  4. Step 4: Simplify right side
    118.61x = 12,928.87
  5. Step 5: Solve for x
    x = 12,928.87/118.61
  6. Step 6: Final answer
    x = 109.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.