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Finding the Fourth Proportional to 256,505.12, 384,799.02 and 79,012.05

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Solution

The fourth proportional to 256,505.12, 384,799.02 and 79,012.05 is: 118,530.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,505.12 : 384,799.02 = 79,012.05 : x
  2. Step 2: Convert to fraction form
    256,505.12/384,799.02 = 79,012.05/x
  3. Step 3: Cross multiply
    256,505.12x = 384,799.02 × 79,012.05
  4. Step 4: Simplify right side
    256,505.12x = 30,403,759,408.19
  5. Step 5: Solve for x
    x = 30,403,759,408.19/256,505.12
  6. Step 6: Final answer
    x = 118,530.81

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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.