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Finding the Fourth Proportional to 145.12, 200.19 and 103.69

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Solution

The fourth proportional to 145.12, 200.19 and 103.69 is: 143.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.12 : 200.19 = 103.69 : x
  2. Step 2: Convert to fraction form
    145.12/200.19 = 103.69/x
  3. Step 3: Cross multiply
    145.12x = 200.19 × 103.69
  4. Step 4: Simplify right side
    145.12x = 20,757.70
  5. Step 5: Solve for x
    x = 20,757.70/145.12
  6. Step 6: Final answer
    x = 143.04

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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.