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Finding the Fourth Proportional to 15,522.99, 21,421.80 and 8,449.47

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Solution

The fourth proportional to 15,522.99, 21,421.80 and 8,449.47 is: 11,660.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,522.99 : 21,421.80 = 8,449.47 : x
  2. Step 2: Convert to fraction form
    15,522.99/21,421.80 = 8,449.47/x
  3. Step 3: Cross multiply
    15,522.99x = 21,421.80 × 8,449.47
  4. Step 4: Simplify right side
    15,522.99x = 181,002,856.45
  5. Step 5: Solve for x
    x = 181,002,856.45/15,522.99
  6. Step 6: Final answer
    x = 11,660.31

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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.