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Finding the Fourth Proportional to 1,392.35, 2,086.70 and 699.80

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Solution

The fourth proportional to 1,392.35, 2,086.70 and 699.80 is: 1,048.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.35 : 2,086.70 = 699.80 : x
  2. Step 2: Convert to fraction form
    1,392.35/2,086.70 = 699.80/x
  3. Step 3: Cross multiply
    1,392.35x = 2,086.70 × 699.80
  4. Step 4: Simplify right side
    1,392.35x = 1,460,272.66
  5. Step 5: Solve for x
    x = 1,460,272.66/1,392.35
  6. Step 6: Final answer
    x = 1,048.78

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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.