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Finding the Fourth Proportional to 2,140.65, 3,210.69 and 679.95

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Solution

The fourth proportional to 2,140.65, 3,210.69 and 679.95 is: 1,019.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,140.65 : 3,210.69 = 679.95 : x
  2. Step 2: Convert to fraction form
    2,140.65/3,210.69 = 679.95/x
  3. Step 3: Cross multiply
    2,140.65x = 3,210.69 × 679.95
  4. Step 4: Simplify right side
    2,140.65x = 2,183,108.67
  5. Step 5: Solve for x
    x = 2,183,108.67/2,140.65
  6. Step 6: Final answer
    x = 1,019.83

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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.