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Finding the Fourth Proportional to 15,864.67, 21,894.12 and 8,790.94

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Solution

The fourth proportional to 15,864.67, 21,894.12 and 8,790.94 is: 12,131.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,864.67 : 21,894.12 = 8,790.94 : x
  2. Step 2: Convert to fraction form
    15,864.67/21,894.12 = 8,790.94/x
  3. Step 3: Cross multiply
    15,864.67x = 21,894.12 × 8,790.94
  4. Step 4: Simplify right side
    15,864.67x = 192,469,741.85
  5. Step 5: Solve for x
    x = 192,469,741.85/15,864.67
  6. Step 6: Final answer
    x = 12,131.98

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1.5x scale

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.