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Finding the Fourth Proportional to 538,999.20, 809,164.40 and 339,319.20

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Solution

The fourth proportional to 538,999.20, 809,164.40 and 339,319.20 is: 509,397.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    538,999.20 : 809,164.40 = 339,319.20 : x
  2. Step 2: Convert to fraction form
    538,999.20/809,164.40 = 339,319.20/x
  3. Step 3: Cross multiply
    538,999.20x = 809,164.40 × 339,319.20
  4. Step 4: Simplify right side
    538,999.20x = 274,565,016,876.48
  5. Step 5: Solve for x
    x = 274,565,016,876.48/538,999.20
  6. Step 6: Final answer
    x = 509,397.82

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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.