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Finding the Fourth Proportional to 256,936.60, 385,404.90 and 212,699.80

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Solution

The fourth proportional to 256,936.60, 385,404.90 and 212,699.80 is: 319,049.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,936.60 : 385,404.90 = 212,699.80 : x
  2. Step 2: Convert to fraction form
    256,936.60/385,404.90 = 212,699.80/x
  3. Step 3: Cross multiply
    256,936.60x = 385,404.90 × 212,699.80
  4. Step 4: Simplify right side
    256,936.60x = 81,975,545,149.02
  5. Step 5: Solve for x
    x = 81,975,545,149.02/256,936.60
  6. Step 6: Final answer
    x = 319,049.70

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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.