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Finding the Fourth Proportional to 813,891.12, 1,220,989.80 and 327,610.48

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Solution

The fourth proportional to 813,891.12, 1,220,989.80 and 327,610.48 is: 491,477.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    813,891.12 : 1,220,989.80 = 327,610.48 : x
  2. Step 2: Convert to fraction form
    813,891.12/1,220,989.80 = 327,610.48/x
  3. Step 3: Cross multiply
    813,891.12x = 1,220,989.80 × 327,610.48
  4. Step 4: Simplify right side
    813,891.12x = 400,009,054,453.10
  5. Step 5: Solve for x
    x = 400,009,054,453.10/813,891.12
  6. Step 6: Final answer
    x = 491,477.35

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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.