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Finding the Fourth Proportional to 212,616.41, 318,764.25 and 128,356.54

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Solution

The fourth proportional to 212,616.41, 318,764.25 and 128,356.54 is: 192,438.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,616.41 : 318,764.25 = 128,356.54 : x
  2. Step 2: Convert to fraction form
    212,616.41/318,764.25 = 128,356.54/x
  3. Step 3: Cross multiply
    212,616.41x = 318,764.25 × 128,356.54
  4. Step 4: Simplify right side
    212,616.41x = 40,915,475,408.78
  5. Step 5: Solve for x
    x = 40,915,475,408.78/212,616.41
  6. Step 6: Final answer
    x = 192,438.00

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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.