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Finding the Fourth Proportional to 639,378,066.90, 896,036,286.30 and 639,378,066.90

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Solution

The fourth proportional to 639,378,066.90, 896,036,286.30 and 639,378,066.90 is: 896,036,286.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,378,066.90 : 896,036,286.30 = 639,378,066.90 : x
  2. Step 2: Convert to fraction form
    639,378,066.90/896,036,286.30 = 639,378,066.90/x
  3. Step 3: Cross multiply
    639,378,066.90x = 896,036,286.30 × 639,378,066.90
  4. Step 4: Simplify right side
    639,378,066.90x = 572,905,948,606,748,928
  5. Step 5: Solve for x
    x = 572,905,948,606,748,928/639,378,066.90
  6. Step 6: Final answer
    x = 896,036,286.30

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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.