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Finding the Fourth Proportional to 1,367.68, 1,887.44 and 778.30

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Solution

The fourth proportional to 1,367.68, 1,887.44 and 778.30 is: 1,074.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,367.68 : 1,887.44 = 778.30 : x
  2. Step 2: Convert to fraction form
    1,367.68/1,887.44 = 778.30/x
  3. Step 3: Cross multiply
    1,367.68x = 1,887.44 × 778.30
  4. Step 4: Simplify right side
    1,367.68x = 1,468,994.55
  5. Step 5: Solve for x
    x = 1,468,994.55/1,367.68
  6. Step 6: Final answer
    x = 1,074.08

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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.