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Finding the Fourth Proportional to 140.45, 210.72 and 68.29

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Solution

The fourth proportional to 140.45, 210.72 and 68.29 is: 102.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.45 : 210.72 = 68.29 : x
  2. Step 2: Convert to fraction form
    140.45/210.72 = 68.29/x
  3. Step 3: Cross multiply
    140.45x = 210.72 × 68.29
  4. Step 4: Simplify right side
    140.45x = 14,389.02
  5. Step 5: Solve for x
    x = 14,389.02/140.45
  6. Step 6: Final answer
    x = 102.45

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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.