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Finding the Fourth Proportional to 393,449.40, 590,319.90 and 127,218.60

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Solution

The fourth proportional to 393,449.40, 590,319.90 and 127,218.60 is: 190,875.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,449.40 : 590,319.90 = 127,218.60 : x
  2. Step 2: Convert to fraction form
    393,449.40/590,319.90 = 127,218.60/x
  3. Step 3: Cross multiply
    393,449.40x = 590,319.90 × 127,218.60
  4. Step 4: Simplify right side
    393,449.40x = 75,099,671,230.14
  5. Step 5: Solve for x
    x = 75,099,671,230.14/393,449.40
  6. Step 6: Final answer
    x = 190,875.04

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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.