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Finding the Fourth Proportional to 36,680.40, 55,020.60 and 8,978.40

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Solution

The fourth proportional to 36,680.40, 55,020.60 and 8,978.40 is: 13,467.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    36,680.40 : 55,020.60 = 8,978.40 : x
  2. Step 2: Convert to fraction form
    36,680.40/55,020.60 = 8,978.40/x
  3. Step 3: Cross multiply
    36,680.40x = 55,020.60 × 8,978.40
  4. Step 4: Simplify right side
    36,680.40x = 493,996,955.04
  5. Step 5: Solve for x
    x = 493,996,955.04/36,680.40
  6. Step 6: Final answer
    x = 13,467.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.