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Finding the Fourth Proportional to 15,155.64, 20,911.50 and 9,187.56

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Solution

The fourth proportional to 15,155.64, 20,911.50 and 9,187.56 is: 12,676.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,155.64 : 20,911.50 = 9,187.56 : x
  2. Step 2: Convert to fraction form
    15,155.64/20,911.50 = 9,187.56/x
  3. Step 3: Cross multiply
    15,155.64x = 20,911.50 × 9,187.56
  4. Step 4: Simplify right side
    15,155.64x = 192,125,660.94
  5. Step 5: Solve for x
    x = 192,125,660.94/15,155.64
  6. Step 6: Final answer
    x = 12,676.84

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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.