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Finding the Fourth Proportional to 1,289.07, 1,778.93 and 699.61

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Solution

The fourth proportional to 1,289.07, 1,778.93 and 699.61 is: 965.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.07 : 1,778.93 = 699.61 : x
  2. Step 2: Convert to fraction form
    1,289.07/1,778.93 = 699.61/x
  3. Step 3: Cross multiply
    1,289.07x = 1,778.93 × 699.61
  4. Step 4: Simplify right side
    1,289.07x = 1,244,560.23
  5. Step 5: Solve for x
    x = 1,244,560.23/1,289.07
  6. Step 6: Final answer
    x = 965.47

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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.