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Finding the Fourth Proportional to 6,391.84, 8,817.90 and 3,738.08

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Solution

The fourth proportional to 6,391.84, 8,817.90 and 3,738.08 is: 5,156.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,391.84 : 8,817.90 = 3,738.08 : x
  2. Step 2: Convert to fraction form
    6,391.84/8,817.90 = 3,738.08/x
  3. Step 3: Cross multiply
    6,391.84x = 8,817.90 × 3,738.08
  4. Step 4: Simplify right side
    6,391.84x = 32,962,015.63
  5. Step 5: Solve for x
    x = 32,962,015.63/6,391.84
  6. Step 6: Final answer
    x = 5,156.89

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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.