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Finding the Fourth Proportional to 212,645.60, 318,968.40 and 128,664.80

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Solution

The fourth proportional to 212,645.60, 318,968.40 and 128,664.80 is: 192,997.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,645.60 : 318,968.40 = 128,664.80 : x
  2. Step 2: Convert to fraction form
    212,645.60/318,968.40 = 128,664.80/x
  3. Step 3: Cross multiply
    212,645.60x = 318,968.40 × 128,664.80
  4. Step 4: Simplify right side
    212,645.60x = 41,040,005,392.32
  5. Step 5: Solve for x
    x = 41,040,005,392.32/212,645.60
  6. Step 6: Final answer
    x = 192,997.20

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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.