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Finding the Fourth Proportional to 15,790.99, 21,790.79 and 8,984.37

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Solution

The fourth proportional to 15,790.99, 21,790.79 and 8,984.37 is: 12,397.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,790.99 : 21,790.79 = 8,984.37 : x
  2. Step 2: Convert to fraction form
    15,790.99/21,790.79 = 8,984.37/x
  3. Step 3: Cross multiply
    15,790.99x = 21,790.79 × 8,984.37
  4. Step 4: Simplify right side
    15,790.99x = 195,776,519.95
  5. Step 5: Solve for x
    x = 195,776,519.95/15,790.99
  6. Step 6: Final answer
    x = 12,397.99

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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.