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Finding the Fourth Proportional to 15,160.84, 20,921.69 and 8,355.08

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Solution

The fourth proportional to 15,160.84, 20,921.69 and 8,355.08 is: 11,529.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,160.84 : 20,921.69 = 8,355.08 : x
  2. Step 2: Convert to fraction form
    15,160.84/20,921.69 = 8,355.08/x
  3. Step 3: Cross multiply
    15,160.84x = 20,921.69 × 8,355.08
  4. Step 4: Simplify right side
    15,160.84x = 174,802,466.88
  5. Step 5: Solve for x
    x = 174,802,466.88/15,160.84
  6. Step 6: Final answer
    x = 11,529.87

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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.