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Finding the Fourth Proportional to 439,912.12, 659,860.08 and 140,390.32

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Solution

The fourth proportional to 439,912.12, 659,860.08 and 140,390.32 is: 210,582.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,912.12 : 659,860.08 = 140,390.32 : x
  2. Step 2: Convert to fraction form
    439,912.12/659,860.08 = 140,390.32/x
  3. Step 3: Cross multiply
    439,912.12x = 659,860.08 × 140,390.32
  4. Step 4: Simplify right side
    439,912.12x = 92,637,967,786.43
  5. Step 5: Solve for x
    x = 92,637,967,786.43/439,912.12
  6. Step 6: Final answer
    x = 210,582.90

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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.