Home / 1,284.20-1,925.85-667.70

Finding the Fourth Proportional to 1,284.20, 1,925.85 and 667.70

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Solution

The fourth proportional to 1,284.20, 1,925.85 and 667.70 is: 1,001.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.20 : 1,925.85 = 667.70 : x
  2. Step 2: Convert to fraction form
    1,284.20/1,925.85 = 667.70/x
  3. Step 3: Cross multiply
    1,284.20x = 1,925.85 × 667.70
  4. Step 4: Simplify right side
    1,284.20x = 1,285,890.05
  5. Step 5: Solve for x
    x = 1,285,890.05/1,284.20
  6. Step 6: Final answer
    x = 1,001.32

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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.