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Finding the Fourth Proportional to 15,921.76, 21,971.58 and 8,848

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Solution

The fourth proportional to 15,921.76, 21,971.58 and 8,848 is: 12,209.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,921.76 : 21,971.58 = 8,848 : x
  2. Step 2: Convert to fraction form
    15,921.76/21,971.58 = 8,848/x
  3. Step 3: Cross multiply
    15,921.76x = 21,971.58 × 8,848
  4. Step 4: Simplify right side
    15,921.76x = 194,404,539.84
  5. Step 5: Solve for x
    x = 194,404,539.84/15,921.76
  6. Step 6: Final answer
    x = 12,209.99

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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.