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Finding the Fourth Proportional to 1,367.69, 1,887.45 and 778.26

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Solution

The fourth proportional to 1,367.69, 1,887.45 and 778.26 is: 1,074.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,367.69 : 1,887.45 = 778.26 : x
  2. Step 2: Convert to fraction form
    1,367.69/1,887.45 = 778.26/x
  3. Step 3: Cross multiply
    1,367.69x = 1,887.45 × 778.26
  4. Step 4: Simplify right side
    1,367.69x = 1,468,926.84
  5. Step 5: Solve for x
    x = 1,468,926.84/1,367.69
  6. Step 6: Final answer
    x = 1,074.02

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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.