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Finding the Fourth Proportional to 291,091.39, 436,655.61 and 91,419.65

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Solution

The fourth proportional to 291,091.39, 436,655.61 and 91,419.65 is: 137,135.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,091.39 : 436,655.61 = 91,419.65 : x
  2. Step 2: Convert to fraction form
    291,091.39/436,655.61 = 91,419.65/x
  3. Step 3: Cross multiply
    291,091.39x = 436,655.61 × 91,419.65
  4. Step 4: Simplify right side
    291,091.39x = 39,918,904,947.10
  5. Step 5: Solve for x
    x = 39,918,904,947.10/291,091.39
  6. Step 6: Final answer
    x = 137,135.30

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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.