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Finding the Fourth Proportional to 256,790.25, 385,186.59 and 90,578.25

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Solution

The fourth proportional to 256,790.25, 385,186.59 and 90,578.25 is: 135,867.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,790.25 : 385,186.59 = 90,578.25 : x
  2. Step 2: Convert to fraction form
    256,790.25/385,186.59 = 90,578.25/x
  3. Step 3: Cross multiply
    256,790.25x = 385,186.59 × 90,578.25
  4. Step 4: Simplify right side
    256,790.25x = 34,889,527,245.67
  5. Step 5: Solve for x
    x = 34,889,527,245.67/256,790.25
  6. Step 6: Final answer
    x = 135,867.80

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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.