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Finding the Fourth Proportional to 291,189.64, 436,786.88 and 91,505.56

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Solution

The fourth proportional to 291,189.64, 436,786.88 and 91,505.56 is: 137,259.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,189.64 : 436,786.88 = 91,505.56 : x
  2. Step 2: Convert to fraction form
    291,189.64/436,786.88 = 91,505.56/x
  3. Step 3: Cross multiply
    291,189.64x = 436,786.88 × 91,505.56
  4. Step 4: Simplify right side
    291,189.64x = 39,968,428,055.05
  5. Step 5: Solve for x
    x = 39,968,428,055.05/291,189.64
  6. Step 6: Final answer
    x = 137,259.10

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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.