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Finding the Fourth Proportional to 8,855.71, 13,267.92 and 7,890.40

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Solution

The fourth proportional to 8,855.71, 13,267.92 and 7,890.40 is: 11,821.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,855.71 : 13,267.92 = 7,890.40 : x
  2. Step 2: Convert to fraction form
    8,855.71/13,267.92 = 7,890.40/x
  3. Step 3: Cross multiply
    8,855.71x = 13,267.92 × 7,890.40
  4. Step 4: Simplify right side
    8,855.71x = 104,689,123.13
  5. Step 5: Solve for x
    x = 104,689,123.13/8,855.71
  6. Step 6: Final answer
    x = 11,821.65

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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.