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Finding the Fourth Proportional to 140.43, 210.69 and 138.15

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Solution

The fourth proportional to 140.43, 210.69 and 138.15 is: 207.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.43 : 210.69 = 138.15 : x
  2. Step 2: Convert to fraction form
    140.43/210.69 = 138.15/x
  3. Step 3: Cross multiply
    140.43x = 210.69 × 138.15
  4. Step 4: Simplify right side
    140.43x = 29,106.82
  5. Step 5: Solve for x
    x = 29,106.82/140.43
  6. Step 6: Final answer
    x = 207.27

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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.