Home / 1,380.27-2,070.39-649.45

Finding the Fourth Proportional to 1,380.27, 2,070.39 and 649.45

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Solution

The fourth proportional to 1,380.27, 2,070.39 and 649.45 is: 974.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.27 : 2,070.39 = 649.45 : x
  2. Step 2: Convert to fraction form
    1,380.27/2,070.39 = 649.45/x
  3. Step 3: Cross multiply
    1,380.27x = 2,070.39 × 649.45
  4. Step 4: Simplify right side
    1,380.27x = 1,344,604.43
  5. Step 5: Solve for x
    x = 1,344,604.43/1,380.27
  6. Step 6: Final answer
    x = 974.16

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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.