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Finding the Fourth Proportional to 1,289.94, 1,780.56 and 765.96

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Solution

The fourth proportional to 1,289.94, 1,780.56 and 765.96 is: 1,057.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.94 : 1,780.56 = 765.96 : x
  2. Step 2: Convert to fraction form
    1,289.94/1,780.56 = 765.96/x
  3. Step 3: Cross multiply
    1,289.94x = 1,780.56 × 765.96
  4. Step 4: Simplify right side
    1,289.94x = 1,363,837.74
  5. Step 5: Solve for x
    x = 1,363,837.74/1,289.94
  6. Step 6: Final answer
    x = 1,057.29

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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.