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Finding the Fourth Proportional to 145.64, 218.46 and 91.91

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Solution

The fourth proportional to 145.64, 218.46 and 91.91 is: 137.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.64 : 218.46 = 91.91 : x
  2. Step 2: Convert to fraction form
    145.64/218.46 = 91.91/x
  3. Step 3: Cross multiply
    145.64x = 218.46 × 91.91
  4. Step 4: Simplify right side
    145.64x = 20,078.66
  5. Step 5: Solve for x
    x = 20,078.66/145.64
  6. Step 6: Final answer
    x = 137.87

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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.