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Finding the Fourth Proportional to 40,978.20, 61,486.80 and 14,685.60

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Solution

The fourth proportional to 40,978.20, 61,486.80 and 14,685.60 is: 22,035.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,978.20 : 61,486.80 = 14,685.60 : x
  2. Step 2: Convert to fraction form
    40,978.20/61,486.80 = 14,685.60/x
  3. Step 3: Cross multiply
    40,978.20x = 61,486.80 × 14,685.60
  4. Step 4: Simplify right side
    40,978.20x = 902,970,550.08
  5. Step 5: Solve for x
    x = 902,970,550.08/40,978.20
  6. Step 6: Final answer
    x = 22,035.39

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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.