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Finding the Fourth Proportional to 667,027.36, 920,315.28 and 428,701.60

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Solution

The fourth proportional to 667,027.36, 920,315.28 and 428,701.60 is: 591,490.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,027.36 : 920,315.28 = 428,701.60 : x
  2. Step 2: Convert to fraction form
    667,027.36/920,315.28 = 428,701.60/x
  3. Step 3: Cross multiply
    667,027.36x = 920,315.28 × 428,701.60
  4. Step 4: Simplify right side
    667,027.36x = 394,540,633,040.45
  5. Step 5: Solve for x
    x = 394,540,633,040.45/667,027.36
  6. Step 6: Final answer
    x = 591,490.93

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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.