Home / 6,420.20-8,860.50-3,901.76

Finding the Fourth Proportional to 6,420.20, 8,860.50 and 3,901.76

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Solution

The fourth proportional to 6,420.20, 8,860.50 and 3,901.76 is: 5,384.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,420.20 : 8,860.50 = 3,901.76 : x
  2. Step 2: Convert to fraction form
    6,420.20/8,860.50 = 3,901.76/x
  3. Step 3: Cross multiply
    6,420.20x = 8,860.50 × 3,901.76
  4. Step 4: Simplify right side
    6,420.20x = 34,571,544.48
  5. Step 5: Solve for x
    x = 34,571,544.48/6,420.20
  6. Step 6: Final answer
    x = 5,384.81

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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.