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Finding the Fourth Proportional to 142.90, 197 and 104.02

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Solution

The fourth proportional to 142.90, 197 and 104.02 is: 143.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.90 : 197 = 104.02 : x
  2. Step 2: Convert to fraction form
    142.90/197 = 104.02/x
  3. Step 3: Cross multiply
    142.90x = 197 × 104.02
  4. Step 4: Simplify right side
    142.90x = 20,491.94
  5. Step 5: Solve for x
    x = 20,491.94/142.90
  6. Step 6: Final answer
    x = 143.40

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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.