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Finding the Fourth Proportional to 321,905.60, 482,858.40 and 85,272.20

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Solution

The fourth proportional to 321,905.60, 482,858.40 and 85,272.20 is: 127,908.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,905.60 : 482,858.40 = 85,272.20 : x
  2. Step 2: Convert to fraction form
    321,905.60/482,858.40 = 85,272.20/x
  3. Step 3: Cross multiply
    321,905.60x = 482,858.40 × 85,272.20
  4. Step 4: Simplify right side
    321,905.60x = 41,174,398,056.48
  5. Step 5: Solve for x
    x = 41,174,398,056.48/321,905.60
  6. Step 6: Final answer
    x = 127,908.30

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1.5x scale

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.