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Finding the Fourth Proportional to 144.36, 215.36 and 139.50

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Solution

The fourth proportional to 144.36, 215.36 and 139.50 is: 208.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.36 : 215.36 = 139.50 : x
  2. Step 2: Convert to fraction form
    144.36/215.36 = 139.50/x
  3. Step 3: Cross multiply
    144.36x = 215.36 × 139.50
  4. Step 4: Simplify right side
    144.36x = 30,042.72
  5. Step 5: Solve for x
    x = 30,042.72/144.36
  6. Step 6: Final answer
    x = 208.11

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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.