Home / 3,900.48-5,381.12-2,405.80

Finding the Fourth Proportional to 3,900.48, 5,381.12 and 2,405.80

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Solution

The fourth proportional to 3,900.48, 5,381.12 and 2,405.80 is: 3,319.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,900.48 : 5,381.12 = 2,405.80 : x
  2. Step 2: Convert to fraction form
    3,900.48/5,381.12 = 2,405.80/x
  3. Step 3: Cross multiply
    3,900.48x = 5,381.12 × 2,405.80
  4. Step 4: Simplify right side
    3,900.48x = 12,945,898.50
  5. Step 5: Solve for x
    x = 12,945,898.50/3,900.48
  6. Step 6: Final answer
    x = 3,319.05

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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.