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Finding the Fourth Proportional to 140.29, 210.45 and 79.40

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Solution

The fourth proportional to 140.29, 210.45 and 79.40 is: 119.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.29 : 210.45 = 79.40 : x
  2. Step 2: Convert to fraction form
    140.29/210.45 = 79.40/x
  3. Step 3: Cross multiply
    140.29x = 210.45 × 79.40
  4. Step 4: Simplify right side
    140.29x = 16,709.73
  5. Step 5: Solve for x
    x = 16,709.73/140.29
  6. Step 6: Final answer
    x = 119.11

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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.