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Finding the Fourth Proportional to 330,421.20, 495,631.80 and 313,362.60

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Solution

The fourth proportional to 330,421.20, 495,631.80 and 313,362.60 is: 470,043.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    330,421.20 : 495,631.80 = 313,362.60 : x
  2. Step 2: Convert to fraction form
    330,421.20/495,631.80 = 313,362.60/x
  3. Step 3: Cross multiply
    330,421.20x = 495,631.80 × 313,362.60
  4. Step 4: Simplify right side
    330,421.20x = 155,312,469,490.68
  5. Step 5: Solve for x
    x = 155,312,469,490.68/330,421.20
  6. Step 6: Final answer
    x = 470,043.90

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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.