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Finding the Fourth Proportional to 639,285.84, 959,084.76 and 212,820.96

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Solution

The fourth proportional to 639,285.84, 959,084.76 and 212,820.96 is: 319,283.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,285.84 : 959,084.76 = 212,820.96 : x
  2. Step 2: Convert to fraction form
    639,285.84/959,084.76 = 212,820.96/x
  3. Step 3: Cross multiply
    639,285.84x = 959,084.76 × 212,820.96
  4. Step 4: Simplify right side
    639,285.84x = 204,113,339,344.57
  5. Step 5: Solve for x
    x = 204,113,339,344.57/639,285.84
  6. Step 6: Final answer
    x = 319,283.37

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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.