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Finding the Fourth Proportional to 392,998.80, 589,498.20 and 108,688.80

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Solution

The fourth proportional to 392,998.80, 589,498.20 and 108,688.80 is: 163,033.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,998.80 : 589,498.20 = 108,688.80 : x
  2. Step 2: Convert to fraction form
    392,998.80/589,498.20 = 108,688.80/x
  3. Step 3: Cross multiply
    392,998.80x = 589,498.20 × 108,688.80
  4. Step 4: Simplify right side
    392,998.80x = 64,071,851,960.16
  5. Step 5: Solve for x
    x = 64,071,851,960.16/392,998.80
  6. Step 6: Final answer
    x = 163,033.20

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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.