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Finding the Fourth Proportional to 72,090.60, 108,135.90 and 40,986.60

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Solution

The fourth proportional to 72,090.60, 108,135.90 and 40,986.60 is: 61,479.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,090.60 : 108,135.90 = 40,986.60 : x
  2. Step 2: Convert to fraction form
    72,090.60/108,135.90 = 40,986.60/x
  3. Step 3: Cross multiply
    72,090.60x = 108,135.90 × 40,986.60
  4. Step 4: Simplify right side
    72,090.60x = 4,432,122,878.94
  5. Step 5: Solve for x
    x = 4,432,122,878.94/72,090.60
  6. Step 6: Final answer
    x = 61,479.90

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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.