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Finding the Fourth Proportional to 15,763.99, 21,754.41 and 8,690.39

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Solution

The fourth proportional to 15,763.99, 21,754.41 and 8,690.39 is: 11,992.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,763.99 : 21,754.41 = 8,690.39 : x
  2. Step 2: Convert to fraction form
    15,763.99/21,754.41 = 8,690.39/x
  3. Step 3: Cross multiply
    15,763.99x = 21,754.41 × 8,690.39
  4. Step 4: Simplify right side
    15,763.99x = 189,054,307.12
  5. Step 5: Solve for x
    x = 189,054,307.12/15,763.99
  6. Step 6: Final answer
    x = 11,992.80

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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.