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Finding the Fourth Proportional to 907,936.80, 1,361,905.20 and 766,219.20

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Solution

The fourth proportional to 907,936.80, 1,361,905.20 and 766,219.20 is: 1,149,328.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    907,936.80 : 1,361,905.20 = 766,219.20 : x
  2. Step 2: Convert to fraction form
    907,936.80/1,361,905.20 = 766,219.20/x
  3. Step 3: Cross multiply
    907,936.80x = 1,361,905.20 × 766,219.20
  4. Step 4: Simplify right side
    907,936.80x = 1,043,517,912,819.84
  5. Step 5: Solve for x
    x = 1,043,517,912,819.84/907,936.80
  6. Step 6: Final answer
    x = 1,149,328.80

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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.