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Finding the Fourth Proportional to 145.09, 217.67 and 53.79

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Solution

The fourth proportional to 145.09, 217.67 and 53.79 is: 80.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.09 : 217.67 = 53.79 : x
  2. Step 2: Convert to fraction form
    145.09/217.67 = 53.79/x
  3. Step 3: Cross multiply
    145.09x = 217.67 × 53.79
  4. Step 4: Simplify right side
    145.09x = 11,708.47
  5. Step 5: Solve for x
    x = 11,708.47/145.09
  6. Step 6: Final answer
    x = 80.70

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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.