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Finding the Fourth Proportional to 1,367.79, 1,887.48 and 778.38

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Solution

The fourth proportional to 1,367.79, 1,887.48 and 778.38 is: 1,074.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,367.79 : 1,887.48 = 778.38 : x
  2. Step 2: Convert to fraction form
    1,367.79/1,887.48 = 778.38/x
  3. Step 3: Cross multiply
    1,367.79x = 1,887.48 × 778.38
  4. Step 4: Simplify right side
    1,367.79x = 1,469,176.68
  5. Step 5: Solve for x
    x = 1,469,176.68/1,367.79
  6. Step 6: Final answer
    x = 1,074.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.