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Finding the Fourth Proportional to 256,460.39, 384,690.89 and 66,920.62

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Solution

The fourth proportional to 256,460.39, 384,690.89 and 66,920.62 is: 100,381.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,460.39 : 384,690.89 = 66,920.62 : x
  2. Step 2: Convert to fraction form
    256,460.39/384,690.89 = 66,920.62/x
  3. Step 3: Cross multiply
    256,460.39x = 384,690.89 × 66,920.62
  4. Step 4: Simplify right side
    256,460.39x = 25,743,753,875.96
  5. Step 5: Solve for x
    x = 25,743,753,875.96/256,460.39
  6. Step 6: Final answer
    x = 100,381.01

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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.