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Finding the Fourth Proportional to 15,129.20, 20,881.72 and 8,845.20

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Solution

The fourth proportional to 15,129.20, 20,881.72 and 8,845.20 is: 12,208.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,129.20 : 20,881.72 = 8,845.20 : x
  2. Step 2: Convert to fraction form
    15,129.20/20,881.72 = 8,845.20/x
  3. Step 3: Cross multiply
    15,129.20x = 20,881.72 × 8,845.20
  4. Step 4: Simplify right side
    15,129.20x = 184,702,989.74
  5. Step 5: Solve for x
    x = 184,702,989.74/15,129.20
  6. Step 6: Final answer
    x = 12,208.38

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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.