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Finding the Fourth Proportional to 379,783.21, 523,683.50 and 243,765.78

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Solution

The fourth proportional to 379,783.21, 523,683.50 and 243,765.78 is: 336,128.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    379,783.21 : 523,683.50 = 243,765.78 : x
  2. Step 2: Convert to fraction form
    379,783.21/523,683.50 = 243,765.78/x
  3. Step 3: Cross multiply
    379,783.21x = 523,683.50 × 243,765.78
  4. Step 4: Simplify right side
    379,783.21x = 127,656,116,850.63
  5. Step 5: Solve for x
    x = 127,656,116,850.63/379,783.21
  6. Step 6: Final answer
    x = 336,128.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.