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Finding the Fourth Proportional to 403,396.20, 605,531.70 and 253,805.40

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Solution

The fourth proportional to 403,396.20, 605,531.70 and 253,805.40 is: 380,983.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,396.20 : 605,531.70 = 253,805.40 : x
  2. Step 2: Convert to fraction form
    403,396.20/605,531.70 = 253,805.40/x
  3. Step 3: Cross multiply
    403,396.20x = 605,531.70 × 253,805.40
  4. Step 4: Simplify right side
    403,396.20x = 153,687,215,331.18
  5. Step 5: Solve for x
    x = 153,687,215,331.18/403,396.20
  6. Step 6: Final answer
    x = 380,983.30

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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.