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Finding the Fourth Proportional to 486.81, 730.26 and 140.15

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Solution

The fourth proportional to 486.81, 730.26 and 140.15 is: 210.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.81 : 730.26 = 140.15 : x
  2. Step 2: Convert to fraction form
    486.81/730.26 = 140.15/x
  3. Step 3: Cross multiply
    486.81x = 730.26 × 140.15
  4. Step 4: Simplify right side
    486.81x = 102,345.94
  5. Step 5: Solve for x
    x = 102,345.94/486.81
  6. Step 6: Final answer
    x = 210.24

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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.