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Finding the Fourth Proportional to 290,784.81, 436,177.22 and 80,422.75

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Solution

The fourth proportional to 290,784.81, 436,177.22 and 80,422.75 is: 120,634.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,784.81 : 436,177.22 = 80,422.75 : x
  2. Step 2: Convert to fraction form
    290,784.81/436,177.22 = 80,422.75/x
  3. Step 3: Cross multiply
    290,784.81x = 436,177.22 × 80,422.75
  4. Step 4: Simplify right side
    290,784.81x = 35,078,571,519.76
  5. Step 5: Solve for x
    x = 35,078,571,519.76/290,784.81
  6. Step 6: Final answer
    x = 120,634.13

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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.