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Finding the Fourth Proportional to 256,981.70, 385,496.85 and 69,993.20

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Solution

The fourth proportional to 256,981.70, 385,496.85 and 69,993.20 is: 104,996.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,981.70 : 385,496.85 = 69,993.20 : x
  2. Step 2: Convert to fraction form
    256,981.70/385,496.85 = 69,993.20/x
  3. Step 3: Cross multiply
    256,981.70x = 385,496.85 × 69,993.20
  4. Step 4: Simplify right side
    256,981.70x = 26,982,158,121.42
  5. Step 5: Solve for x
    x = 26,982,158,121.42/256,981.70
  6. Step 6: Final answer
    x = 104,996.42

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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.