Home / 1,281.87-1,921.38-1,178.07

Finding the Fourth Proportional to 1,281.87, 1,921.38 and 1,178.07

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Solution

The fourth proportional to 1,281.87, 1,921.38 and 1,178.07 is: 1,765.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.87 : 1,921.38 = 1,178.07 : x
  2. Step 2: Convert to fraction form
    1,281.87/1,921.38 = 1,178.07/x
  3. Step 3: Cross multiply
    1,281.87x = 1,921.38 × 1,178.07
  4. Step 4: Simplify right side
    1,281.87x = 2,263,520.14
  5. Step 5: Solve for x
    x = 2,263,520.14/1,281.87
  6. Step 6: Final answer
    x = 1,765.80

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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.