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Finding the Fourth Proportional to 3,986.79, 5,502.03 and 2,218.40

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Solution

The fourth proportional to 3,986.79, 5,502.03 and 2,218.40 is: 3,061.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.79 : 5,502.03 = 2,218.40 : x
  2. Step 2: Convert to fraction form
    3,986.79/5,502.03 = 2,218.40/x
  3. Step 3: Cross multiply
    3,986.79x = 5,502.03 × 2,218.40
  4. Step 4: Simplify right side
    3,986.79x = 12,205,675.84
  5. Step 5: Solve for x
    x = 12,205,675.84/3,986.79
  6. Step 6: Final answer
    x = 3,061.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.