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Finding the Fourth Proportional to 15,215.95, 20,999 and 8,501.62

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Solution

The fourth proportional to 15,215.95, 20,999 and 8,501.62 is: 11,732.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,215.95 : 20,999 = 8,501.62 : x
  2. Step 2: Convert to fraction form
    15,215.95/20,999 = 8,501.62/x
  3. Step 3: Cross multiply
    15,215.95x = 20,999 × 8,501.62
  4. Step 4: Simplify right side
    15,215.95x = 178,525,518.38
  5. Step 5: Solve for x
    x = 178,525,518.38/15,215.95
  6. Step 6: Final answer
    x = 11,732.79

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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.