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Finding the Fourth Proportional to 290,840.63, 436,260.94 and 80,478.56

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Solution

The fourth proportional to 290,840.63, 436,260.94 and 80,478.56 is: 120,717.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,840.63 : 436,260.94 = 80,478.56 : x
  2. Step 2: Convert to fraction form
    290,840.63/436,260.94 = 80,478.56/x
  3. Step 3: Cross multiply
    290,840.63x = 436,260.94 × 80,478.56
  4. Step 4: Simplify right side
    290,840.63x = 35,109,653,124.90
  5. Step 5: Solve for x
    x = 35,109,653,124.90/290,840.63
  6. Step 6: Final answer
    x = 120,717.84

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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.