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Finding the Fourth Proportional to 6,642,869.90, 9,964,304.85 and 2,155,145.90

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Solution

The fourth proportional to 6,642,869.90, 9,964,304.85 and 2,155,145.90 is: 3,232,718.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,642,869.90 : 9,964,304.85 = 2,155,145.90 : x
  2. Step 2: Convert to fraction form
    6,642,869.90/9,964,304.85 = 2,155,145.90/x
  3. Step 3: Cross multiply
    6,642,869.90x = 9,964,304.85 × 2,155,145.90
  4. Step 4: Simplify right side
    6,642,869.90x = 21,474,530,743,827.61
  5. Step 5: Solve for x
    x = 21,474,530,743,827.61/6,642,869.90
  6. Step 6: Final answer
    x = 3,232,718.85

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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.