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Finding the Fourth Proportional to 256,709.22, 385,115.18 and 79,209.56

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Solution

The fourth proportional to 256,709.22, 385,115.18 and 79,209.56 is: 118,830.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,709.22 : 385,115.18 = 79,209.56 : x
  2. Step 2: Convert to fraction form
    256,709.22/385,115.18 = 79,209.56/x
  3. Step 3: Cross multiply
    256,709.22x = 385,115.18 × 79,209.56
  4. Step 4: Simplify right side
    256,709.22x = 30,504,804,523.86
  5. Step 5: Solve for x
    x = 30,504,804,523.86/256,709.22
  6. Step 6: Final answer
    x = 118,830.19

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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.