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Finding the Fourth Proportional to 1,378.28, 2,064.48 and 858.44

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Solution

The fourth proportional to 1,378.28, 2,064.48 and 858.44 is: 1,285.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.28 : 2,064.48 = 858.44 : x
  2. Step 2: Convert to fraction form
    1,378.28/2,064.48 = 858.44/x
  3. Step 3: Cross multiply
    1,378.28x = 2,064.48 × 858.44
  4. Step 4: Simplify right side
    1,378.28x = 1,772,232.21
  5. Step 5: Solve for x
    x = 1,772,232.21/1,378.28
  6. Step 6: Final answer
    x = 1,285.83

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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.