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Finding the Fourth Proportional to 15,913.61, 21,961.55 and 8,839.88

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Solution

The fourth proportional to 15,913.61, 21,961.55 and 8,839.88 is: 12,199.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,913.61 : 21,961.55 = 8,839.88 : x
  2. Step 2: Convert to fraction form
    15,913.61/21,961.55 = 8,839.88/x
  3. Step 3: Cross multiply
    15,913.61x = 21,961.55 × 8,839.88
  4. Step 4: Simplify right side
    15,913.61x = 194,137,378.91
  5. Step 5: Solve for x
    x = 194,137,378.91/15,913.61
  6. Step 6: Final answer
    x = 12,199.46

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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.