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Finding the Fourth Proportional to 402,420.40, 603,630.60 and 396,199.60

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Solution

The fourth proportional to 402,420.40, 603,630.60 and 396,199.60 is: 594,299.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,420.40 : 603,630.60 = 396,199.60 : x
  2. Step 2: Convert to fraction form
    402,420.40/603,630.60 = 396,199.60/x
  3. Step 3: Cross multiply
    402,420.40x = 603,630.60 × 396,199.60
  4. Step 4: Simplify right side
    402,420.40x = 239,158,202,267.76
  5. Step 5: Solve for x
    x = 239,158,202,267.76/402,420.40
  6. Step 6: Final answer
    x = 594,299.40

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1.5x scale

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.