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Finding the Fourth Proportional to 639,378,233.40, 896,036,519.40 and 639,378,233.40

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Solution

The fourth proportional to 639,378,233.40, 896,036,519.40 and 639,378,233.40 is: 896,036,519.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,378,233.40 : 896,036,519.40 = 639,378,233.40 : x
  2. Step 2: Convert to fraction form
    639,378,233.40/896,036,519.40 = 639,378,233.40/x
  3. Step 3: Cross multiply
    639,378,233.40x = 896,036,519.40 × 639,378,233.40
  4. Step 4: Simplify right side
    639,378,233.40x = 572,906,246,835,856,768
  5. Step 5: Solve for x
    x = 572,906,246,835,856,768/639,378,233.40
  6. Step 6: Final answer
    x = 896,036,519.40

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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.