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Finding the Fourth Proportional to 1,444.60, 1,993.20 and 855.28

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Solution

The fourth proportional to 1,444.60, 1,993.20 and 855.28 is: 1,180.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,444.60 : 1,993.20 = 855.28 : x
  2. Step 2: Convert to fraction form
    1,444.60/1,993.20 = 855.28/x
  3. Step 3: Cross multiply
    1,444.60x = 1,993.20 × 855.28
  4. Step 4: Simplify right side
    1,444.60x = 1,704,744.10
  5. Step 5: Solve for x
    x = 1,704,744.10/1,444.60
  6. Step 6: Final answer
    x = 1,180.08

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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.