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Finding the Fourth Proportional to 665,643.60, 998,611.20 and 328,845.60

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Solution

The fourth proportional to 665,643.60, 998,611.20 and 328,845.60 is: 493,340.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,643.60 : 998,611.20 = 328,845.60 : x
  2. Step 2: Convert to fraction form
    665,643.60/998,611.20 = 328,845.60/x
  3. Step 3: Cross multiply
    665,643.60x = 998,611.20 × 328,845.60
  4. Step 4: Simplify right side
    665,643.60x = 328,388,899,230.72
  5. Step 5: Solve for x
    x = 328,388,899,230.72/665,643.60
  6. Step 6: Final answer
    x = 493,340.43

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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.