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Finding the Fourth Proportional to 318,640.60, 477,960.90 and 274,317.40

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Solution

The fourth proportional to 318,640.60, 477,960.90 and 274,317.40 is: 411,476.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,640.60 : 477,960.90 = 274,317.40 : x
  2. Step 2: Convert to fraction form
    318,640.60/477,960.90 = 274,317.40/x
  3. Step 3: Cross multiply
    318,640.60x = 477,960.90 × 274,317.40
  4. Step 4: Simplify right side
    318,640.60x = 131,112,991,389.66
  5. Step 5: Solve for x
    x = 131,112,991,389.66/318,640.60
  6. Step 6: Final answer
    x = 411,476.10

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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.