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Finding the Fourth Proportional to 403,485.20, 605,665.20 and 253,894.40

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Solution

The fourth proportional to 403,485.20, 605,665.20 and 253,894.40 is: 381,116.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,485.20 : 605,665.20 = 253,894.40 : x
  2. Step 2: Convert to fraction form
    403,485.20/605,665.20 = 253,894.40/x
  3. Step 3: Cross multiply
    403,485.20x = 605,665.20 × 253,894.40
  4. Step 4: Simplify right side
    403,485.20x = 153,775,002,554.88
  5. Step 5: Solve for x
    x = 153,775,002,554.88/403,485.20
  6. Step 6: Final answer
    x = 381,116.84

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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.