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Finding the Fourth Proportional to 486.92, 730.50 and 140.28

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Solution

The fourth proportional to 486.92, 730.50 and 140.28 is: 210.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.92 : 730.50 = 140.28 : x
  2. Step 2: Convert to fraction form
    486.92/730.50 = 140.28/x
  3. Step 3: Cross multiply
    486.92x = 730.50 × 140.28
  4. Step 4: Simplify right side
    486.92x = 102,474.54
  5. Step 5: Solve for x
    x = 102,474.54/486.92
  6. Step 6: Final answer
    x = 210.45

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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.