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Finding the Fourth Proportional to 143.40, 197.85 and 124.95

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Solution

The fourth proportional to 143.40, 197.85 and 124.95 is: 172.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.40 : 197.85 = 124.95 : x
  2. Step 2: Convert to fraction form
    143.40/197.85 = 124.95/x
  3. Step 3: Cross multiply
    143.40x = 197.85 × 124.95
  4. Step 4: Simplify right side
    143.40x = 24,720.24
  5. Step 5: Solve for x
    x = 24,720.24/143.40
  6. Step 6: Final answer
    x = 172.39

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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.