Home / 1,391.14-1,919.61-801.70

Finding the Fourth Proportional to 1,391.14, 1,919.61 and 801.70

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Solution

The fourth proportional to 1,391.14, 1,919.61 and 801.70 is: 1,106.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.14 : 1,919.61 = 801.70 : x
  2. Step 2: Convert to fraction form
    1,391.14/1,919.61 = 801.70/x
  3. Step 3: Cross multiply
    1,391.14x = 1,919.61 × 801.70
  4. Step 4: Simplify right side
    1,391.14x = 1,538,951.34
  5. Step 5: Solve for x
    x = 1,538,951.34/1,391.14
  6. Step 6: Final answer
    x = 1,106.25

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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.