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Finding the Fourth Proportional to 420,515.60, 629,736.60 and 279,510.80

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Solution

The fourth proportional to 420,515.60, 629,736.60 and 279,510.80 is: 418,577.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,515.60 : 629,736.60 = 279,510.80 : x
  2. Step 2: Convert to fraction form
    420,515.60/629,736.60 = 279,510.80/x
  3. Step 3: Cross multiply
    420,515.60x = 629,736.60 × 279,510.80
  4. Step 4: Simplify right side
    420,515.60x = 176,018,180,855.28
  5. Step 5: Solve for x
    x = 176,018,180,855.28/420,515.60
  6. Step 6: Final answer
    x = 418,577.05

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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.