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Finding the Fourth Proportional to 1,434.90, 2,149.65 and 739.20

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Solution

The fourth proportional to 1,434.90, 2,149.65 and 739.20 is: 1,107.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,434.90 : 2,149.65 = 739.20 : x
  2. Step 2: Convert to fraction form
    1,434.90/2,149.65 = 739.20/x
  3. Step 3: Cross multiply
    1,434.90x = 2,149.65 × 739.20
  4. Step 4: Simplify right side
    1,434.90x = 1,589,021.28
  5. Step 5: Solve for x
    x = 1,589,021.28/1,434.90
  6. Step 6: Final answer
    x = 1,107.41

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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.