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Finding the Fourth Proportional to 256,830.40, 385,245.60 and 255,080.80

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Solution

The fourth proportional to 256,830.40, 385,245.60 and 255,080.80 is: 382,621.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,830.40 : 385,245.60 = 255,080.80 : x
  2. Step 2: Convert to fraction form
    256,830.40/385,245.60 = 255,080.80/x
  3. Step 3: Cross multiply
    256,830.40x = 385,245.60 × 255,080.80
  4. Step 4: Simplify right side
    256,830.40x = 98,268,755,844.48
  5. Step 5: Solve for x
    x = 98,268,755,844.48/256,830.40
  6. Step 6: Final answer
    x = 382,621.20

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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.