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Finding the Fourth Proportional to 1,379.78, 1,903.38 and 854.90

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Solution

The fourth proportional to 1,379.78, 1,903.38 and 854.90 is: 1,179.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.78 : 1,903.38 = 854.90 : x
  2. Step 2: Convert to fraction form
    1,379.78/1,903.38 = 854.90/x
  3. Step 3: Cross multiply
    1,379.78x = 1,903.38 × 854.90
  4. Step 4: Simplify right side
    1,379.78x = 1,627,193.98
  5. Step 5: Solve for x
    x = 1,627,193.98/1,379.78
  6. Step 6: Final answer
    x = 1,179.32

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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.