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Finding the Fourth Proportional to 780.83, 1,077.72 and 449.45

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Solution

The fourth proportional to 780.83, 1,077.72 and 449.45 is: 620.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.83 : 1,077.72 = 449.45 : x
  2. Step 2: Convert to fraction form
    780.83/1,077.72 = 449.45/x
  3. Step 3: Cross multiply
    780.83x = 1,077.72 × 449.45
  4. Step 4: Simplify right side
    780.83x = 484,375.87
  5. Step 5: Solve for x
    x = 484,375.87/780.83
  6. Step 6: Final answer
    x = 620.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.