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Finding the Fourth Proportional to 486.88, 730.18 and 140.23

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Solution

The fourth proportional to 486.88, 730.18 and 140.23 is: 210.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.88 : 730.18 = 140.23 : x
  2. Step 2: Convert to fraction form
    486.88/730.18 = 140.23/x
  3. Step 3: Cross multiply
    486.88x = 730.18 × 140.23
  4. Step 4: Simplify right side
    486.88x = 102,394.23
  5. Step 5: Solve for x
    x = 102,394.23/486.88
  6. Step 6: Final answer
    x = 210.31

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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.