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Finding the Fourth Proportional to 205,518.70, 308,205.15 and 72,403.30

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Solution

The fourth proportional to 205,518.70, 308,205.15 and 72,403.30 is: 108,579.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,518.70 : 308,205.15 = 72,403.30 : x
  2. Step 2: Convert to fraction form
    205,518.70/308,205.15 = 72,403.30/x
  3. Step 3: Cross multiply
    205,518.70x = 308,205.15 × 72,403.30
  4. Step 4: Simplify right side
    205,518.70x = 22,315,069,937.00
  5. Step 5: Solve for x
    x = 22,315,069,937.00/205,518.70
  6. Step 6: Final answer
    x = 108,579.27

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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.