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Finding the Fourth Proportional to 28,405,772.40, 42,608,658.60 and 19,713,759.60

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Solution

The fourth proportional to 28,405,772.40, 42,608,658.60 and 19,713,759.60 is: 29,570,639.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,405,772.40 : 42,608,658.60 = 19,713,759.60 : x
  2. Step 2: Convert to fraction form
    28,405,772.40/42,608,658.60 = 19,713,759.60/x
  3. Step 3: Cross multiply
    28,405,772.40x = 42,608,658.60 × 19,713,759.60
  4. Step 4: Simplify right side
    28,405,772.40x = 839,976,852,518,872.62
  5. Step 5: Solve for x
    x = 839,976,852,518,872.62/28,405,772.40
  6. Step 6: Final answer
    x = 29,570,639.40

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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.