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Finding the Fourth Proportional to 145.13, 200.21 and 103.68

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Solution

The fourth proportional to 145.13, 200.21 and 103.68 is: 143.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.13 : 200.21 = 103.68 : x
  2. Step 2: Convert to fraction form
    145.13/200.21 = 103.68/x
  3. Step 3: Cross multiply
    145.13x = 200.21 × 103.68
  4. Step 4: Simplify right side
    145.13x = 20,757.25
  5. Step 5: Solve for x
    x = 20,757.25/145.13
  6. Step 6: Final answer
    x = 143.03

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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.