Home / 6,389.40-8,817.78-3,871.76

Finding the Fourth Proportional to 6,389.40, 8,817.78 and 3,871.76

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Solution

The fourth proportional to 6,389.40, 8,817.78 and 3,871.76 is: 5,343.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,389.40 : 8,817.78 = 3,871.76 : x
  2. Step 2: Convert to fraction form
    6,389.40/8,817.78 = 3,871.76/x
  3. Step 3: Cross multiply
    6,389.40x = 8,817.78 × 3,871.76
  4. Step 4: Simplify right side
    6,389.40x = 34,140,283.80
  5. Step 5: Solve for x
    x = 34,140,283.80/6,389.40
  6. Step 6: Final answer
    x = 5,343.27

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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.