Home / 1,386.87-2,077.21-1,278.83

Finding the Fourth Proportional to 1,386.87, 2,077.21 and 1,278.83

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Solution

The fourth proportional to 1,386.87, 2,077.21 and 1,278.83 is: 1,915.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.87 : 2,077.21 = 1,278.83 : x
  2. Step 2: Convert to fraction form
    1,386.87/2,077.21 = 1,278.83/x
  3. Step 3: Cross multiply
    1,386.87x = 2,077.21 × 1,278.83
  4. Step 4: Simplify right side
    1,386.87x = 2,656,393.35
  5. Step 5: Solve for x
    x = 2,656,393.35/1,386.87
  6. Step 6: Final answer
    x = 1,915.39

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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.