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Finding the Fourth Proportional to 145.74, 218.36 and 91.50

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Solution

The fourth proportional to 145.74, 218.36 and 91.50 is: 137.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.74 : 218.36 = 91.50 : x
  2. Step 2: Convert to fraction form
    145.74/218.36 = 91.50/x
  3. Step 3: Cross multiply
    145.74x = 218.36 × 91.50
  4. Step 4: Simplify right side
    145.74x = 19,979.94
  5. Step 5: Solve for x
    x = 19,979.94/145.74
  6. Step 6: Final answer
    x = 137.09

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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.