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Finding the Fourth Proportional to 2,641.48, 3,961.92 and 693.84

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Solution

The fourth proportional to 2,641.48, 3,961.92 and 693.84 is: 1,040.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,641.48 : 3,961.92 = 693.84 : x
  2. Step 2: Convert to fraction form
    2,641.48/3,961.92 = 693.84/x
  3. Step 3: Cross multiply
    2,641.48x = 3,961.92 × 693.84
  4. Step 4: Simplify right side
    2,641.48x = 2,748,938.57
  5. Step 5: Solve for x
    x = 2,748,938.57/2,641.48
  6. Step 6: Final answer
    x = 1,040.68

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1.5x scale

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.