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Finding the Fourth Proportional to 638,968.64, 958,093.20 and 212,276

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Solution

The fourth proportional to 638,968.64, 958,093.20 and 212,276 is: 318,294.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,968.64 : 958,093.20 = 212,276 : x
  2. Step 2: Convert to fraction form
    638,968.64/958,093.20 = 212,276/x
  3. Step 3: Cross multiply
    638,968.64x = 958,093.20 × 212,276
  4. Step 4: Simplify right side
    638,968.64x = 203,380,192,123.20
  5. Step 5: Solve for x
    x = 203,380,192,123.20/638,968.64
  6. Step 6: Final answer
    x = 318,294.48

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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.