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Finding the Fourth Proportional to 1,326.84, 1,831.54 and 1,139.58

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Solution

The fourth proportional to 1,326.84, 1,831.54 and 1,139.58 is: 1,573.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.84 : 1,831.54 = 1,139.58 : x
  2. Step 2: Convert to fraction form
    1,326.84/1,831.54 = 1,139.58/x
  3. Step 3: Cross multiply
    1,326.84x = 1,831.54 × 1,139.58
  4. Step 4: Simplify right side
    1,326.84x = 2,087,183.50
  5. Step 5: Solve for x
    x = 2,087,183.50/1,326.84
  6. Step 6: Final answer
    x = 1,573.05

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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.