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Finding the Fourth Proportional to 212,803.23, 318,641.70 and 128,450.64

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Solution

The fourth proportional to 212,803.23, 318,641.70 and 128,450.64 is: 192,336.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,803.23 : 318,641.70 = 128,450.64 : x
  2. Step 2: Convert to fraction form
    212,803.23/318,641.70 = 128,450.64/x
  3. Step 3: Cross multiply
    212,803.23x = 318,641.70 × 128,450.64
  4. Step 4: Simplify right side
    212,803.23x = 40,929,731,249.75
  5. Step 5: Solve for x
    x = 40,929,731,249.75/212,803.23
  6. Step 6: Final answer
    x = 192,336.04

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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.