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Finding the Fourth Proportional to 402,406.20, 603,609.30 and 397,157.40

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Solution

The fourth proportional to 402,406.20, 603,609.30 and 397,157.40 is: 595,736.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,406.20 : 603,609.30 = 397,157.40 : x
  2. Step 2: Convert to fraction form
    402,406.20/603,609.30 = 397,157.40/x
  3. Step 3: Cross multiply
    402,406.20x = 603,609.30 × 397,157.40
  4. Step 4: Simplify right side
    402,406.20x = 239,727,900,203.82
  5. Step 5: Solve for x
    x = 239,727,900,203.82/402,406.20
  6. Step 6: Final answer
    x = 595,736.10

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Double scale
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Similar ratio
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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.