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Finding the Fourth Proportional to 6,378.80, 8,802.28 and 3,989.84

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Solution

The fourth proportional to 6,378.80, 8,802.28 and 3,989.84 is: 5,505.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,378.80 : 8,802.28 = 3,989.84 : x
  2. Step 2: Convert to fraction form
    6,378.80/8,802.28 = 3,989.84/x
  3. Step 3: Cross multiply
    6,378.80x = 8,802.28 × 3,989.84
  4. Step 4: Simplify right side
    6,378.80x = 35,119,700.87
  5. Step 5: Solve for x
    x = 35,119,700.87/6,378.80
  6. Step 6: Final answer
    x = 5,505.70

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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.