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Finding the Fourth Proportional to 321,912.40, 482,868.60 and 308,261.20

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Solution

The fourth proportional to 321,912.40, 482,868.60 and 308,261.20 is: 462,391.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,912.40 : 482,868.60 = 308,261.20 : x
  2. Step 2: Convert to fraction form
    321,912.40/482,868.60 = 308,261.20/x
  3. Step 3: Cross multiply
    321,912.40x = 482,868.60 × 308,261.20
  4. Step 4: Simplify right side
    321,912.40x = 148,849,654,078.32
  5. Step 5: Solve for x
    x = 148,849,654,078.32/321,912.40
  6. Step 6: Final answer
    x = 462,391.80

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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.