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Finding the Fourth Proportional to 145.50, 217.95 and 128.22

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Solution

The fourth proportional to 145.50, 217.95 and 128.22 is: 192.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.50 : 217.95 = 128.22 : x
  2. Step 2: Convert to fraction form
    145.50/217.95 = 128.22/x
  3. Step 3: Cross multiply
    145.50x = 217.95 × 128.22
  4. Step 4: Simplify right side
    145.50x = 27,945.55
  5. Step 5: Solve for x
    x = 27,945.55/145.50
  6. Step 6: Final answer
    x = 192.07

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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.