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Finding the Fourth Proportional to 145.87, 218.64 and 84.94

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Solution

The fourth proportional to 145.87, 218.64 and 84.94 is: 127.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.87 : 218.64 = 84.94 : x
  2. Step 2: Convert to fraction form
    145.87/218.64 = 84.94/x
  3. Step 3: Cross multiply
    145.87x = 218.64 × 84.94
  4. Step 4: Simplify right side
    145.87x = 18,571.28
  5. Step 5: Solve for x
    x = 18,571.28/145.87
  6. Step 6: Final answer
    x = 127.31

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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.