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Finding the Fourth Proportional to 1,279,384, 1,765,705.44 and 742,840

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Solution

The fourth proportional to 1,279,384, 1,765,705.44 and 742,840 is: 1,025,209.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279,384 : 1,765,705.44 = 742,840 : x
  2. Step 2: Convert to fraction form
    1,279,384/1,765,705.44 = 742,840/x
  3. Step 3: Cross multiply
    1,279,384x = 1,765,705.44 × 742,840
  4. Step 4: Simplify right side
    1,279,384x = 1,311,636,629,049.60
  5. Step 5: Solve for x
    x = 1,311,636,629,049.60/1,279,384
  6. Step 6: Final answer
    x = 1,025,209.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.