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Finding the Fourth Proportional to 1,260.78, 1,889.07 and 772.80

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Solution

The fourth proportional to 1,260.78, 1,889.07 and 772.80 is: 1,157.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.78 : 1,889.07 = 772.80 : x
  2. Step 2: Convert to fraction form
    1,260.78/1,889.07 = 772.80/x
  3. Step 3: Cross multiply
    1,260.78x = 1,889.07 × 772.80
  4. Step 4: Simplify right side
    1,260.78x = 1,459,869.43
  5. Step 5: Solve for x
    x = 1,459,869.43/1,260.78
  6. Step 6: Final answer
    x = 1,157.91

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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.