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Finding the Fourth Proportional to 140.40, 210.60 and 86.33

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Solution

The fourth proportional to 140.40, 210.60 and 86.33 is: 129.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.40 : 210.60 = 86.33 : x
  2. Step 2: Convert to fraction form
    140.40/210.60 = 86.33/x
  3. Step 3: Cross multiply
    140.40x = 210.60 × 86.33
  4. Step 4: Simplify right side
    140.40x = 18,180.05
  5. Step 5: Solve for x
    x = 18,180.05/140.40
  6. Step 6: Final answer
    x = 129.49

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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.