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Finding the Fourth Proportional to 18,992.88, 28,461.78 and 7,885.76

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Solution

The fourth proportional to 18,992.88, 28,461.78 and 7,885.76 is: 11,817.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,992.88 : 28,461.78 = 7,885.76 : x
  2. Step 2: Convert to fraction form
    18,992.88/28,461.78 = 7,885.76/x
  3. Step 3: Cross multiply
    18,992.88x = 28,461.78 × 7,885.76
  4. Step 4: Simplify right side
    18,992.88x = 224,442,623.94
  5. Step 5: Solve for x
    x = 224,442,623.94/18,992.88
  6. Step 6: Final answer
    x = 11,817.20

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1.5x scale

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.