Home / 1,431.95-2,148.41-1,278.86

Finding the Fourth Proportional to 1,431.95, 2,148.41 and 1,278.86

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Solution

The fourth proportional to 1,431.95, 2,148.41 and 1,278.86 is: 1,918.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.95 : 2,148.41 = 1,278.86 : x
  2. Step 2: Convert to fraction form
    1,431.95/2,148.41 = 1,278.86/x
  3. Step 3: Cross multiply
    1,431.95x = 2,148.41 × 1,278.86
  4. Step 4: Simplify right side
    1,431.95x = 2,747,508.07
  5. Step 5: Solve for x
    x = 2,747,508.07/1,431.95
  6. Step 6: Final answer
    x = 1,918.72

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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.