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Finding the Fourth Proportional to 145.64, 200.96 and 103.72

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Solution

The fourth proportional to 145.64, 200.96 and 103.72 is: 143.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.64 : 200.96 = 103.72 : x
  2. Step 2: Convert to fraction form
    145.64/200.96 = 103.72/x
  3. Step 3: Cross multiply
    145.64x = 200.96 × 103.72
  4. Step 4: Simplify right side
    145.64x = 20,843.57
  5. Step 5: Solve for x
    x = 20,843.57/145.64
  6. Step 6: Final answer
    x = 143.12

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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.