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Finding the Fourth Proportional to 1,250.80, 1,725.60 and 778.36

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Solution

The fourth proportional to 1,250.80, 1,725.60 and 778.36 is: 1,073.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,250.80 : 1,725.60 = 778.36 : x
  2. Step 2: Convert to fraction form
    1,250.80/1,725.60 = 778.36/x
  3. Step 3: Cross multiply
    1,250.80x = 1,725.60 × 778.36
  4. Step 4: Simplify right side
    1,250.80x = 1,343,138.02
  5. Step 5: Solve for x
    x = 1,343,138.02/1,250.80
  6. Step 6: Final answer
    x = 1,073.82

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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.