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Finding the Fourth Proportional to 403,892.80, 605,839.20 and 193,422.40

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Solution

The fourth proportional to 403,892.80, 605,839.20 and 193,422.40 is: 290,133.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,892.80 : 605,839.20 = 193,422.40 : x
  2. Step 2: Convert to fraction form
    403,892.80/605,839.20 = 193,422.40/x
  3. Step 3: Cross multiply
    403,892.80x = 605,839.20 × 193,422.40
  4. Step 4: Simplify right side
    403,892.80x = 117,182,872,078.08
  5. Step 5: Solve for x
    x = 117,182,872,078.08/403,892.80
  6. Step 6: Final answer
    x = 290,133.60

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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.