Home / 1,685.79-2,326.26-939.78

Finding the Fourth Proportional to 1,685.79, 2,326.26 and 939.78

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Solution

The fourth proportional to 1,685.79, 2,326.26 and 939.78 is: 1,296.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,685.79 : 2,326.26 = 939.78 : x
  2. Step 2: Convert to fraction form
    1,685.79/2,326.26 = 939.78/x
  3. Step 3: Cross multiply
    1,685.79x = 2,326.26 × 939.78
  4. Step 4: Simplify right side
    1,685.79x = 2,186,172.62
  5. Step 5: Solve for x
    x = 2,186,172.62/1,685.79
  6. Step 6: Final answer
    x = 1,296.82

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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.