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Finding the Fourth Proportional to 261,311.40, 391,383.90 and 201,954.60

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Solution

The fourth proportional to 261,311.40, 391,383.90 and 201,954.60 is: 302,481.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,311.40 : 391,383.90 = 201,954.60 : x
  2. Step 2: Convert to fraction form
    261,311.40/391,383.90 = 201,954.60/x
  3. Step 3: Cross multiply
    261,311.40x = 391,383.90 × 201,954.60
  4. Step 4: Simplify right side
    261,311.40x = 79,041,778,970.94
  5. Step 5: Solve for x
    x = 79,041,778,970.94/261,311.40
  6. Step 6: Final answer
    x = 302,481.17

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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.