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Finding the Fourth Proportional to 392,639.94, 589,052.18 and 126,390.46

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Solution

The fourth proportional to 392,639.94, 589,052.18 and 126,390.46 is: 189,615.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,639.94 : 589,052.18 = 126,390.46 : x
  2. Step 2: Convert to fraction form
    392,639.94/589,052.18 = 126,390.46/x
  3. Step 3: Cross multiply
    392,639.94x = 589,052.18 × 126,390.46
  4. Step 4: Simplify right side
    392,639.94x = 74,450,575,994.20
  5. Step 5: Solve for x
    x = 74,450,575,994.20/392,639.94
  6. Step 6: Final answer
    x = 189,615.39

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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.