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Finding the Fourth Proportional to 403,385.20, 605,077.80 and 338,431.30

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Solution

The fourth proportional to 403,385.20, 605,077.80 and 338,431.30 is: 507,646.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,385.20 : 605,077.80 = 338,431.30 : x
  2. Step 2: Convert to fraction form
    403,385.20/605,077.80 = 338,431.30/x
  3. Step 3: Cross multiply
    403,385.20x = 605,077.80 × 338,431.30
  4. Step 4: Simplify right side
    403,385.20x = 204,777,266,455.14
  5. Step 5: Solve for x
    x = 204,777,266,455.14/403,385.20
  6. Step 6: Final answer
    x = 507,646.95

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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.