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Finding the Fourth Proportional to 144.40, 216.61 and 86.99

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Solution

The fourth proportional to 144.40, 216.61 and 86.99 is: 130.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.40 : 216.61 = 86.99 : x
  2. Step 2: Convert to fraction form
    144.40/216.61 = 86.99/x
  3. Step 3: Cross multiply
    144.40x = 216.61 × 86.99
  4. Step 4: Simplify right side
    144.40x = 18,842.47
  5. Step 5: Solve for x
    x = 18,842.47/144.40
  6. Step 6: Final answer
    x = 130.49

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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.