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Finding the Fourth Proportional to 1,388.95, 1,917.20 and 799.63

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Solution

The fourth proportional to 1,388.95, 1,917.20 and 799.63 is: 1,103.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.95 : 1,917.20 = 799.63 : x
  2. Step 2: Convert to fraction form
    1,388.95/1,917.20 = 799.63/x
  3. Step 3: Cross multiply
    1,388.95x = 1,917.20 × 799.63
  4. Step 4: Simplify right side
    1,388.95x = 1,533,043.05
  5. Step 5: Solve for x
    x = 1,533,043.05/1,388.95
  6. Step 6: Final answer
    x = 1,103.75

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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.