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Finding the Fourth Proportional to 74,990.60, 103,487.08 and 40,998.54

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Solution

The fourth proportional to 74,990.60, 103,487.08 and 40,998.54 is: 56,578.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,990.60 : 103,487.08 = 40,998.54 : x
  2. Step 2: Convert to fraction form
    74,990.60/103,487.08 = 40,998.54/x
  3. Step 3: Cross multiply
    74,990.60x = 103,487.08 × 40,998.54
  4. Step 4: Simplify right side
    74,990.60x = 4,242,819,188.86
  5. Step 5: Solve for x
    x = 4,242,819,188.86/74,990.60
  6. Step 6: Final answer
    x = 56,578.01

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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.