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Finding the Fourth Proportional to 256,861.61, 385,382.38 and 79,368.62

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Solution

The fourth proportional to 256,861.61, 385,382.38 and 79,368.62 is: 119,080.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,861.61 : 385,382.38 = 79,368.62 : x
  2. Step 2: Convert to fraction form
    256,861.61/385,382.38 = 79,368.62/x
  3. Step 3: Cross multiply
    256,861.61x = 385,382.38 × 79,368.62
  4. Step 4: Simplify right side
    256,861.61x = 30,587,268,127.09
  5. Step 5: Solve for x
    x = 30,587,268,127.09/256,861.61
  6. Step 6: Final answer
    x = 119,080.73

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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.