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Finding the Fourth Proportional to 321,935.60, 482,903.40 and 85,314.80

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Solution

The fourth proportional to 321,935.60, 482,903.40 and 85,314.80 is: 127,972.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,935.60 : 482,903.40 = 85,314.80 : x
  2. Step 2: Convert to fraction form
    321,935.60/482,903.40 = 85,314.80/x
  3. Step 3: Cross multiply
    321,935.60x = 482,903.40 × 85,314.80
  4. Step 4: Simplify right side
    321,935.60x = 41,198,806,990.32
  5. Step 5: Solve for x
    x = 41,198,806,990.32/321,935.60
  6. Step 6: Final answer
    x = 127,972.20

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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.