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Finding the Fourth Proportional to 256,845.80, 385,268.70 and 69,857.30

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Solution

The fourth proportional to 256,845.80, 385,268.70 and 69,857.30 is: 104,785.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,845.80 : 385,268.70 = 69,857.30 : x
  2. Step 2: Convert to fraction form
    256,845.80/385,268.70 = 69,857.30/x
  3. Step 3: Cross multiply
    256,845.80x = 385,268.70 × 69,857.30
  4. Step 4: Simplify right side
    256,845.80x = 26,913,831,156.51
  5. Step 5: Solve for x
    x = 26,913,831,156.51/256,845.80
  6. Step 6: Final answer
    x = 104,785.95

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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.