Home / 1,410.20-2,115.30-485.68

Finding the Fourth Proportional to 1,410.20, 2,115.30 and 485.68

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Solution

The fourth proportional to 1,410.20, 2,115.30 and 485.68 is: 728.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,410.20 : 2,115.30 = 485.68 : x
  2. Step 2: Convert to fraction form
    1,410.20/2,115.30 = 485.68/x
  3. Step 3: Cross multiply
    1,410.20x = 2,115.30 × 485.68
  4. Step 4: Simplify right side
    1,410.20x = 1,027,358.90
  5. Step 5: Solve for x
    x = 1,027,358.90/1,410.20
  6. Step 6: Final answer
    x = 728.52

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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.