Home / 1,427.49-2,139.48-1,261.40

Finding the Fourth Proportional to 1,427.49, 2,139.48 and 1,261.40

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Solution

The fourth proportional to 1,427.49, 2,139.48 and 1,261.40 is: 1,890.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,427.49 : 2,139.48 = 1,261.40 : x
  2. Step 2: Convert to fraction form
    1,427.49/2,139.48 = 1,261.40/x
  3. Step 3: Cross multiply
    1,427.49x = 2,139.48 × 1,261.40
  4. Step 4: Simplify right side
    1,427.49x = 2,698,729.37
  5. Step 5: Solve for x
    x = 2,698,729.37/1,427.49
  6. Step 6: Final answer
    x = 1,890.54

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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.