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Finding the Fourth Proportional to 6,639,371.80, 9,968,388.90 and 5,221,029.40

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Solution

The fourth proportional to 6,639,371.80, 9,968,388.90 and 5,221,029.40 is: 7,838,881.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,639,371.80 : 9,968,388.90 = 5,221,029.40 : x
  2. Step 2: Convert to fraction form
    6,639,371.80/9,968,388.90 = 5,221,029.40/x
  3. Step 3: Cross multiply
    6,639,371.80x = 9,968,388.90 × 5,221,029.40
  4. Step 4: Simplify right side
    6,639,371.80x = 52,045,251,517,533.66
  5. Step 5: Solve for x
    x = 52,045,251,517,533.66/6,639,371.80
  6. Step 6: Final answer
    x = 7,838,881.91

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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.