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Finding the Fourth Proportional to 691,486.40, 1,037,375.40 and 218,219.60

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Solution

The fourth proportional to 691,486.40, 1,037,375.40 and 218,219.60 is: 327,375.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,486.40 : 1,037,375.40 = 218,219.60 : x
  2. Step 2: Convert to fraction form
    691,486.40/1,037,375.40 = 218,219.60/x
  3. Step 3: Cross multiply
    691,486.40x = 1,037,375.40 × 218,219.60
  4. Step 4: Simplify right side
    691,486.40x = 226,375,644,837.84
  5. Step 5: Solve for x
    x = 226,375,644,837.84/691,486.40
  6. Step 6: Final answer
    x = 327,375.41

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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.