Home / 428,537.07-642,780.09-191,816.19

Finding the Fourth Proportional to 428,537.07, 642,780.09 and 191,816.19

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Solution

The fourth proportional to 428,537.07, 642,780.09 and 191,816.19 is: 287,712.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,537.07 : 642,780.09 = 191,816.19 : x
  2. Step 2: Convert to fraction form
    428,537.07/642,780.09 = 191,816.19/x
  3. Step 3: Cross multiply
    428,537.07x = 642,780.09 × 191,816.19
  4. Step 4: Simplify right side
    428,537.07x = 123,295,627,871.66
  5. Step 5: Solve for x
    x = 123,295,627,871.66/428,537.07
  6. Step 6: Final answer
    x = 287,712.86

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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.