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Finding the Fourth Proportional to 639,790,090.20, 896,915,449.80 and 639,790,090.20

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Solution

The fourth proportional to 639,790,090.20, 896,915,449.80 and 639,790,090.20 is: 896,915,449.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,790,090.20 : 896,915,449.80 = 639,790,090.20 : x
  2. Step 2: Convert to fraction form
    639,790,090.20/896,915,449.80 = 639,790,090.20/x
  3. Step 3: Cross multiply
    639,790,090.20x = 896,915,449.80 × 639,790,090.20
  4. Step 4: Simplify right side
    639,790,090.20x = 573,837,616,529,315,584
  5. Step 5: Solve for x
    x = 573,837,616,529,315,584/639,790,090.20
  6. Step 6: Final answer
    x = 896,915,449.80

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.