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Finding the Fourth Proportional to 145.17, 200.42 and 103.79

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Solution

The fourth proportional to 145.17, 200.42 and 103.79 is: 143.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.17 : 200.42 = 103.79 : x
  2. Step 2: Convert to fraction form
    145.17/200.42 = 103.79/x
  3. Step 3: Cross multiply
    145.17x = 200.42 × 103.79
  4. Step 4: Simplify right side
    145.17x = 20,800.07
  5. Step 5: Solve for x
    x = 20,800.07/145.17
  6. Step 6: Final answer
    x = 143.28

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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.