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Finding the Fourth Proportional to 612,906.20, 919,359.30 and 423,949.40

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Solution

The fourth proportional to 612,906.20, 919,359.30 and 423,949.40 is: 635,924.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,906.20 : 919,359.30 = 423,949.40 : x
  2. Step 2: Convert to fraction form
    612,906.20/919,359.30 = 423,949.40/x
  3. Step 3: Cross multiply
    612,906.20x = 919,359.30 × 423,949.40
  4. Step 4: Simplify right side
    612,906.20x = 389,761,823,619.42
  5. Step 5: Solve for x
    x = 389,761,823,619.42/612,906.20
  6. Step 6: Final answer
    x = 635,924.10

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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.