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Finding the Fourth Proportional to 15,191,969.20, 20,964,915.98 and 8,222,645.63

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Solution

The fourth proportional to 15,191,969.20, 20,964,915.98 and 8,222,645.63 is: 11,347,250.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,191,969.20 : 20,964,915.98 = 8,222,645.63 : x
  2. Step 2: Convert to fraction form
    15,191,969.20/20,964,915.98 = 8,222,645.63/x
  3. Step 3: Cross multiply
    15,191,969.20x = 20,964,915.98 × 8,222,645.63
  4. Step 4: Simplify right side
    15,191,969.20x = 172,387,074,725,150.94
  5. Step 5: Solve for x
    x = 172,387,074,725,150.94/15,191,969.20
  6. Step 6: Final answer
    x = 11,347,250.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.