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Finding the Fourth Proportional to 145.75, 218.72 and 84.91

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Solution

The fourth proportional to 145.75, 218.72 and 84.91 is: 127.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.75 : 218.72 = 84.91 : x
  2. Step 2: Convert to fraction form
    145.75/218.72 = 84.91/x
  3. Step 3: Cross multiply
    145.75x = 218.72 × 84.91
  4. Step 4: Simplify right side
    145.75x = 18,571.52
  5. Step 5: Solve for x
    x = 18,571.52/145.75
  6. Step 6: Final answer
    x = 127.42

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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.