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Finding the Fourth Proportional to 640,564.80, 960,409.80 and 303,766.80

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Solution

The fourth proportional to 640,564.80, 960,409.80 and 303,766.80 is: 455,442.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,564.80 : 960,409.80 = 303,766.80 : x
  2. Step 2: Convert to fraction form
    640,564.80/960,409.80 = 303,766.80/x
  3. Step 3: Cross multiply
    640,564.80x = 960,409.80 × 303,766.80
  4. Step 4: Simplify right side
    640,564.80x = 291,740,611,634.64
  5. Step 5: Solve for x
    x = 291,740,611,634.64/640,564.80
  6. Step 6: Final answer
    x = 455,442.78

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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.