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Finding the Fourth Proportional to 392,718.21, 589,065.55 and 108,426.12

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Solution

The fourth proportional to 392,718.21, 589,065.55 and 108,426.12 is: 162,635.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,718.21 : 589,065.55 = 108,426.12 : x
  2. Step 2: Convert to fraction form
    392,718.21/589,065.55 = 108,426.12/x
  3. Step 3: Cross multiply
    392,718.21x = 589,065.55 × 108,426.12
  4. Step 4: Simplify right side
    392,718.21x = 63,870,089,532.10
  5. Step 5: Solve for x
    x = 63,870,089,532.10/392,718.21
  6. Step 6: Final answer
    x = 162,635.93

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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.