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Finding the Fourth Proportional to 808.44, 1,115.28 and 621.60

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Solution

The fourth proportional to 808.44, 1,115.28 and 621.60 is: 857.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.44 : 1,115.28 = 621.60 : x
  2. Step 2: Convert to fraction form
    808.44/1,115.28 = 621.60/x
  3. Step 3: Cross multiply
    808.44x = 1,115.28 × 621.60
  4. Step 4: Simplify right side
    808.44x = 693,258.05
  5. Step 5: Solve for x
    x = 693,258.05/808.44
  6. Step 6: Final answer
    x = 857.53

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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.