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Finding the Fourth Proportional to 212,725.80, 319,088.70 and 154,114.20

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Solution

The fourth proportional to 212,725.80, 319,088.70 and 154,114.20 is: 231,171.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,725.80 : 319,088.70 = 154,114.20 : x
  2. Step 2: Convert to fraction form
    212,725.80/319,088.70 = 154,114.20/x
  3. Step 3: Cross multiply
    212,725.80x = 319,088.70 × 154,114.20
  4. Step 4: Simplify right side
    212,725.80x = 49,176,099,729.54
  5. Step 5: Solve for x
    x = 49,176,099,729.54/212,725.80
  6. Step 6: Final answer
    x = 231,171.30

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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.