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Finding the Fourth Proportional to 205,981.20, 308,971.80 and 72,865.80

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Solution

The fourth proportional to 205,981.20, 308,971.80 and 72,865.80 is: 109,298.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,981.20 : 308,971.80 = 72,865.80 : x
  2. Step 2: Convert to fraction form
    205,981.20/308,971.80 = 72,865.80/x
  3. Step 3: Cross multiply
    205,981.20x = 308,971.80 × 72,865.80
  4. Step 4: Simplify right side
    205,981.20x = 22,513,477,384.44
  5. Step 5: Solve for x
    x = 22,513,477,384.44/205,981.20
  6. Step 6: Final answer
    x = 109,298.70

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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.