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Finding the Fourth Proportional to 198,415.80, 297,623.70 and 139,318.20

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Solution

The fourth proportional to 198,415.80, 297,623.70 and 139,318.20 is: 208,977.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    198,415.80 : 297,623.70 = 139,318.20 : x
  2. Step 2: Convert to fraction form
    198,415.80/297,623.70 = 139,318.20/x
  3. Step 3: Cross multiply
    198,415.80x = 297,623.70 × 139,318.20
  4. Step 4: Simplify right side
    198,415.80x = 41,464,398,161.34
  5. Step 5: Solve for x
    x = 41,464,398,161.34/198,415.80
  6. Step 6: Final answer
    x = 208,977.30

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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.