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Finding the Fourth Proportional to 486.12, 729.22 and 144.12

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Solution

The fourth proportional to 486.12, 729.22 and 144.12 is: 216.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.12 : 729.22 = 144.12 : x
  2. Step 2: Convert to fraction form
    486.12/729.22 = 144.12/x
  3. Step 3: Cross multiply
    486.12x = 729.22 × 144.12
  4. Step 4: Simplify right side
    486.12x = 105,095.19
  5. Step 5: Solve for x
    x = 105,095.19/486.12
  6. Step 6: Final answer
    x = 216.19

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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.