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Finding the Fourth Proportional to 839,906.40, 1,259,859.60 and 278,940.90

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Solution

The fourth proportional to 839,906.40, 1,259,859.60 and 278,940.90 is: 418,411.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    839,906.40 : 1,259,859.60 = 278,940.90 : x
  2. Step 2: Convert to fraction form
    839,906.40/1,259,859.60 = 278,940.90/x
  3. Step 3: Cross multiply
    839,906.40x = 1,259,859.60 × 278,940.90
  4. Step 4: Simplify right side
    839,906.40x = 351,426,370,697.64
  5. Step 5: Solve for x
    x = 351,426,370,697.64/839,906.40
  6. Step 6: Final answer
    x = 418,411.35

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Double scale
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Similar ratio
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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.