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Finding the Fourth Proportional to 2,661.86, 3,984.59 and 1,688.65

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Solution

The fourth proportional to 2,661.86, 3,984.59 and 1,688.65 is: 2,527.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,661.86 : 3,984.59 = 1,688.65 : x
  2. Step 2: Convert to fraction form
    2,661.86/3,984.59 = 1,688.65/x
  3. Step 3: Cross multiply
    2,661.86x = 3,984.59 × 1,688.65
  4. Step 4: Simplify right side
    2,661.86x = 6,728,572.16
  5. Step 5: Solve for x
    x = 6,728,572.16/2,661.86
  6. Step 6: Final answer
    x = 2,527.77

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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.