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Finding the Fourth Proportional to 212,616.65, 318,764.62 and 128,356.79

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Solution

The fourth proportional to 212,616.65, 318,764.62 and 128,356.79 is: 192,438.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,616.65 : 318,764.62 = 128,356.79 : x
  2. Step 2: Convert to fraction form
    212,616.65/318,764.62 = 128,356.79/x
  3. Step 3: Cross multiply
    212,616.65x = 318,764.62 × 128,356.79
  4. Step 4: Simplify right side
    212,616.65x = 40,915,603,388.77
  5. Step 5: Solve for x
    x = 40,915,603,388.77/212,616.65
  6. Step 6: Final answer
    x = 192,438.38

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1.5x scale

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.