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Finding the Fourth Proportional to 398,139.20, 597,208.80 and 211,054.40

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Solution

The fourth proportional to 398,139.20, 597,208.80 and 211,054.40 is: 316,581.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,139.20 : 597,208.80 = 211,054.40 : x
  2. Step 2: Convert to fraction form
    398,139.20/597,208.80 = 211,054.40/x
  3. Step 3: Cross multiply
    398,139.20x = 597,208.80 × 211,054.40
  4. Step 4: Simplify right side
    398,139.20x = 126,043,544,958.72
  5. Step 5: Solve for x
    x = 126,043,544,958.72/398,139.20
  6. Step 6: Final answer
    x = 316,581.60

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Similar ratio
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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.