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Finding the Fourth Proportional to 6,639,389.80, 9,968,415.90 and 5,221,047.40

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Solution

The fourth proportional to 6,639,389.80, 9,968,415.90 and 5,221,047.40 is: 7,838,908.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,639,389.80 : 9,968,415.90 = 5,221,047.40 : x
  2. Step 2: Convert to fraction form
    6,639,389.80/9,968,415.90 = 5,221,047.40/x
  3. Step 3: Cross multiply
    6,639,389.80x = 9,968,415.90 × 5,221,047.40
  4. Step 4: Simplify right side
    6,639,389.80x = 52,045,571,916,813.66
  5. Step 5: Solve for x
    x = 52,045,571,916,813.66/6,639,389.80
  6. Step 6: Final answer
    x = 7,838,908.92

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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.