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Finding the Fourth Proportional to 290,323.60, 435,485.44 and 90,661.08

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Solution

The fourth proportional to 290,323.60, 435,485.44 and 90,661.08 is: 135,991.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,323.60 : 435,485.44 = 90,661.08 : x
  2. Step 2: Convert to fraction form
    290,323.60/435,485.44 = 90,661.08/x
  3. Step 3: Cross multiply
    290,323.60x = 435,485.44 × 90,661.08
  4. Step 4: Simplify right side
    290,323.60x = 39,481,580,314.68
  5. Step 5: Solve for x
    x = 39,481,580,314.68/290,323.60
  6. Step 6: Final answer
    x = 135,991.63

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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.