Home / 3,137.20-4,705.80-1,287.10

Finding the Fourth Proportional to 3,137.20, 4,705.80 and 1,287.10

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Solution

The fourth proportional to 3,137.20, 4,705.80 and 1,287.10 is: 1,930.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,137.20 : 4,705.80 = 1,287.10 : x
  2. Step 2: Convert to fraction form
    3,137.20/4,705.80 = 1,287.10/x
  3. Step 3: Cross multiply
    3,137.20x = 4,705.80 × 1,287.10
  4. Step 4: Simplify right side
    3,137.20x = 6,056,835.18
  5. Step 5: Solve for x
    x = 6,056,835.18/3,137.20
  6. Step 6: Final answer
    x = 1,930.65

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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.