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Finding the Fourth Proportional to 858,645,986.40, 1,287,968,979.60 and 858,645,986.40

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Solution

The fourth proportional to 858,645,986.40, 1,287,968,979.60 and 858,645,986.40 is: 1,287,968,979.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,645,986.40 : 1,287,968,979.60 = 858,645,986.40 : x
  2. Step 2: Convert to fraction form
    858,645,986.40/1,287,968,979.60 = 858,645,986.40/x
  3. Step 3: Cross multiply
    858,645,986.40x = 1,287,968,979.60 × 858,645,986.40
  4. Step 4: Simplify right side
    858,645,986.40x = 1,105,909,394,941,243,392
  5. Step 5: Solve for x
    x = 1,105,909,394,941,243,392/858,645,986.40
  6. Step 6: Final answer
    x = 1,287,968,979.60

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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.