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Finding the Fourth Proportional to 290,729.20, 436,036.20 and 140,969.20

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Solution

The fourth proportional to 290,729.20, 436,036.20 and 140,969.20 is: 211,425.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,729.20 : 436,036.20 = 140,969.20 : x
  2. Step 2: Convert to fraction form
    290,729.20/436,036.20 = 140,969.20/x
  3. Step 3: Cross multiply
    290,729.20x = 436,036.20 × 140,969.20
  4. Step 4: Simplify right side
    290,729.20x = 61,467,674,285.04
  5. Step 5: Solve for x
    x = 61,467,674,285.04/290,729.20
  6. Step 6: Final answer
    x = 211,425.87

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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.