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Finding the Fourth Proportional to 140.16, 210.24 and 79.36

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Solution

The fourth proportional to 140.16, 210.24 and 79.36 is: 119.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.16 : 210.24 = 79.36 : x
  2. Step 2: Convert to fraction form
    140.16/210.24 = 79.36/x
  3. Step 3: Cross multiply
    140.16x = 210.24 × 79.36
  4. Step 4: Simplify right side
    140.16x = 16,684.65
  5. Step 5: Solve for x
    x = 16,684.65/140.16
  6. Step 6: Final answer
    x = 119.04

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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.