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Finding the Fourth Proportional to 15,724.80, 21,700.67 and 8,651.67

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Solution

The fourth proportional to 15,724.80, 21,700.67 and 8,651.67 is: 11,939.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,724.80 : 21,700.67 = 8,651.67 : x
  2. Step 2: Convert to fraction form
    15,724.80/21,700.67 = 8,651.67/x
  3. Step 3: Cross multiply
    15,724.80x = 21,700.67 × 8,651.67
  4. Step 4: Simplify right side
    15,724.80x = 187,746,992.36
  5. Step 5: Solve for x
    x = 187,746,992.36/15,724.80
  6. Step 6: Final answer
    x = 11,939.55

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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.