Home / 1,380.12-2,070.16-455.75

Finding the Fourth Proportional to 1,380.12, 2,070.16 and 455.75

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Solution

The fourth proportional to 1,380.12, 2,070.16 and 455.75 is: 683.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.12 : 2,070.16 = 455.75 : x
  2. Step 2: Convert to fraction form
    1,380.12/2,070.16 = 455.75/x
  3. Step 3: Cross multiply
    1,380.12x = 2,070.16 × 455.75
  4. Step 4: Simplify right side
    1,380.12x = 943,475.42
  5. Step 5: Solve for x
    x = 943,475.42/1,380.12
  6. Step 6: Final answer
    x = 683.62

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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.