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Finding the Fourth Proportional to 140.45, 210.65 and 49.15

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Solution

The fourth proportional to 140.45, 210.65 and 49.15 is: 73.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.45 : 210.65 = 49.15 : x
  2. Step 2: Convert to fraction form
    140.45/210.65 = 49.15/x
  3. Step 3: Cross multiply
    140.45x = 210.65 × 49.15
  4. Step 4: Simplify right side
    140.45x = 10,353.20
  5. Step 5: Solve for x
    x = 10,353.20/140.45
  6. Step 6: Final answer
    x = 73.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.