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Finding the Fourth Proportional to 318,630.40, 477,945.60 and 262,643.20

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Solution

The fourth proportional to 318,630.40, 477,945.60 and 262,643.20 is: 393,964.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,630.40 : 477,945.60 = 262,643.20 : x
  2. Step 2: Convert to fraction form
    318,630.40/477,945.60 = 262,643.20/x
  3. Step 3: Cross multiply
    318,630.40x = 477,945.60 × 262,643.20
  4. Step 4: Simplify right side
    318,630.40x = 125,529,161,809.92
  5. Step 5: Solve for x
    x = 125,529,161,809.92/318,630.40
  6. Step 6: Final answer
    x = 393,964.80

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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.