Home / 1,284.40-1,927.81-668.55

Finding the Fourth Proportional to 1,284.40, 1,927.81 and 668.55

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Solution

The fourth proportional to 1,284.40, 1,927.81 and 668.55 is: 1,003.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.40 : 1,927.81 = 668.55 : x
  2. Step 2: Convert to fraction form
    1,284.40/1,927.81 = 668.55/x
  3. Step 3: Cross multiply
    1,284.40x = 1,927.81 × 668.55
  4. Step 4: Simplify right side
    1,284.40x = 1,288,826.07
  5. Step 5: Solve for x
    x = 1,288,826.07/1,284.40
  6. Step 6: Final answer
    x = 1,003.44

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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.