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Finding the Fourth Proportional to 680,912.80, 939,659.64 and 394,488.24

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Solution

The fourth proportional to 680,912.80, 939,659.64 and 394,488.24 is: 544,393.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,912.80 : 939,659.64 = 394,488.24 : x
  2. Step 2: Convert to fraction form
    680,912.80/939,659.64 = 394,488.24/x
  3. Step 3: Cross multiply
    680,912.80x = 939,659.64 × 394,488.24
  4. Step 4: Simplify right side
    680,912.80x = 370,684,677,582.63
  5. Step 5: Solve for x
    x = 370,684,677,582.63/680,912.80
  6. Step 6: Final answer
    x = 544,393.76

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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.