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Finding the Fourth Proportional to 15,105.79, 20,845.53 and 8,391.25

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Solution

The fourth proportional to 15,105.79, 20,845.53 and 8,391.25 is: 11,579.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,105.79 : 20,845.53 = 8,391.25 : x
  2. Step 2: Convert to fraction form
    15,105.79/20,845.53 = 8,391.25/x
  3. Step 3: Cross multiply
    15,105.79x = 20,845.53 × 8,391.25
  4. Step 4: Simplify right side
    15,105.79x = 174,919,938.81
  5. Step 5: Solve for x
    x = 174,919,938.81/15,105.79
  6. Step 6: Final answer
    x = 11,579.66

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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.