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Finding the Fourth Proportional to 13,618.78, 18,750.46 and 11,621.32

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Solution

The fourth proportional to 13,618.78, 18,750.46 and 11,621.32 is: 16,000.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,618.78 : 18,750.46 = 11,621.32 : x
  2. Step 2: Convert to fraction form
    13,618.78/18,750.46 = 11,621.32/x
  3. Step 3: Cross multiply
    13,618.78x = 18,750.46 × 11,621.32
  4. Step 4: Simplify right side
    13,618.78x = 217,905,019.88
  5. Step 5: Solve for x
    x = 217,905,019.88/13,618.78
  6. Step 6: Final answer
    x = 16,000.34

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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.