Home / 1,261.47-1,890.82-1,078.31

Finding the Fourth Proportional to 1,261.47, 1,890.82 and 1,078.31

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Solution

The fourth proportional to 1,261.47, 1,890.82 and 1,078.31 is: 1,616.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.47 : 1,890.82 = 1,078.31 : x
  2. Step 2: Convert to fraction form
    1,261.47/1,890.82 = 1,078.31/x
  3. Step 3: Cross multiply
    1,261.47x = 1,890.82 × 1,078.31
  4. Step 4: Simplify right side
    1,261.47x = 2,038,890.11
  5. Step 5: Solve for x
    x = 2,038,890.11/1,261.47
  6. Step 6: Final answer
    x = 1,616.28

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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.