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Finding the Fourth Proportional to 1,378.88, 1,903.20 and 855.68

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Solution

The fourth proportional to 1,378.88, 1,903.20 and 855.68 is: 1,181.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.88 : 1,903.20 = 855.68 : x
  2. Step 2: Convert to fraction form
    1,378.88/1,903.20 = 855.68/x
  3. Step 3: Cross multiply
    1,378.88x = 1,903.20 × 855.68
  4. Step 4: Simplify right side
    1,378.88x = 1,628,530.18
  5. Step 5: Solve for x
    x = 1,628,530.18/1,378.88
  6. Step 6: Final answer
    x = 1,181.05

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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.