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Finding the Fourth Proportional to 145.69, 200.94 and 129.11

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Solution

The fourth proportional to 145.69, 200.94 and 129.11 is: 178.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.69 : 200.94 = 129.11 : x
  2. Step 2: Convert to fraction form
    145.69/200.94 = 129.11/x
  3. Step 3: Cross multiply
    145.69x = 200.94 × 129.11
  4. Step 4: Simplify right side
    145.69x = 25,943.36
  5. Step 5: Solve for x
    x = 25,943.36/145.69
  6. Step 6: Final answer
    x = 178.07

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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.