Home / 1,326.19-1,989.29-839.58

Finding the Fourth Proportional to 1,326.19, 1,989.29 and 839.58

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Solution

The fourth proportional to 1,326.19, 1,989.29 and 839.58 is: 1,259.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.19 : 1,989.29 = 839.58 : x
  2. Step 2: Convert to fraction form
    1,326.19/1,989.29 = 839.58/x
  3. Step 3: Cross multiply
    1,326.19x = 1,989.29 × 839.58
  4. Step 4: Simplify right side
    1,326.19x = 1,670,173.93
  5. Step 5: Solve for x
    x = 1,670,173.93/1,326.19
  6. Step 6: Final answer
    x = 1,259.38

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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.