Home / 1,380.19-2,070.35-455.83

Finding the Fourth Proportional to 1,380.19, 2,070.35 and 455.83

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Solution

The fourth proportional to 1,380.19, 2,070.35 and 455.83 is: 683.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.19 : 2,070.35 = 455.83 : x
  2. Step 2: Convert to fraction form
    1,380.19/2,070.35 = 455.83/x
  3. Step 3: Cross multiply
    1,380.19x = 2,070.35 × 455.83
  4. Step 4: Simplify right side
    1,380.19x = 943,727.64
  5. Step 5: Solve for x
    x = 943,727.64/1,380.19
  6. Step 6: Final answer
    x = 683.77

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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.