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Finding the Fourth Proportional to 145.11, 200.46 and 128.55

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Solution

The fourth proportional to 145.11, 200.46 and 128.55 is: 177.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.11 : 200.46 = 128.55 : x
  2. Step 2: Convert to fraction form
    145.11/200.46 = 128.55/x
  3. Step 3: Cross multiply
    145.11x = 200.46 × 128.55
  4. Step 4: Simplify right side
    145.11x = 25,769.13
  5. Step 5: Solve for x
    x = 25,769.13/145.11
  6. Step 6: Final answer
    x = 177.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.