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Finding the Fourth Proportional to 15,525.77, 21,421.91 and 8,809.88

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Solution

The fourth proportional to 15,525.77, 21,421.91 and 8,809.88 is: 12,155.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,525.77 : 21,421.91 = 8,809.88 : x
  2. Step 2: Convert to fraction form
    15,525.77/21,421.91 = 8,809.88/x
  3. Step 3: Cross multiply
    15,525.77x = 21,421.91 × 8,809.88
  4. Step 4: Simplify right side
    15,525.77x = 188,724,371.39
  5. Step 5: Solve for x
    x = 188,724,371.39/15,525.77
  6. Step 6: Final answer
    x = 12,155.56

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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.