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Finding the Fourth Proportional to 145.22, 200.11 and 103.70

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Solution

The fourth proportional to 145.22, 200.11 and 103.70 is: 142.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.22 : 200.11 = 103.70 : x
  2. Step 2: Convert to fraction form
    145.22/200.11 = 103.70/x
  3. Step 3: Cross multiply
    145.22x = 200.11 × 103.70
  4. Step 4: Simplify right side
    145.22x = 20,751.41
  5. Step 5: Solve for x
    x = 20,751.41/145.22
  6. Step 6: Final answer
    x = 142.90

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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.