Home / 1,320.60-1,977.71-1,261.37

Finding the Fourth Proportional to 1,320.60, 1,977.71 and 1,261.37

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Solution

The fourth proportional to 1,320.60, 1,977.71 and 1,261.37 is: 1,889.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.60 : 1,977.71 = 1,261.37 : x
  2. Step 2: Convert to fraction form
    1,320.60/1,977.71 = 1,261.37/x
  3. Step 3: Cross multiply
    1,320.60x = 1,977.71 × 1,261.37
  4. Step 4: Simplify right side
    1,320.60x = 2,494,622.70
  5. Step 5: Solve for x
    x = 2,494,622.70/1,320.60
  6. Step 6: Final answer
    x = 1,889.01

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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.