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Finding the Fourth Proportional to 144.68, 215.60 and 140.50

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Solution

The fourth proportional to 144.68, 215.60 and 140.50 is: 209.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.68 : 215.60 = 140.50 : x
  2. Step 2: Convert to fraction form
    144.68/215.60 = 140.50/x
  3. Step 3: Cross multiply
    144.68x = 215.60 × 140.50
  4. Step 4: Simplify right side
    144.68x = 30,292.16
  5. Step 5: Solve for x
    x = 30,292.16/144.68
  6. Step 6: Final answer
    x = 209.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.