Home / 3,240.80-4,861.20-1,858.40

Finding the Fourth Proportional to 3,240.80, 4,861.20 and 1,858.40

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Solution

The fourth proportional to 3,240.80, 4,861.20 and 1,858.40 is: 2,787.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,240.80 : 4,861.20 = 1,858.40 : x
  2. Step 2: Convert to fraction form
    3,240.80/4,861.20 = 1,858.40/x
  3. Step 3: Cross multiply
    3,240.80x = 4,861.20 × 1,858.40
  4. Step 4: Simplify right side
    3,240.80x = 9,034,054.08
  5. Step 5: Solve for x
    x = 9,034,054.08/3,240.80
  6. Step 6: Final answer
    x = 2,787.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.