Home / 428,519.03-642,859.79-172,371.20

Finding the Fourth Proportional to 428,519.03, 642,859.79 and 172,371.20

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Solution

The fourth proportional to 428,519.03, 642,859.79 and 172,371.20 is: 258,589.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,519.03 : 642,859.79 = 172,371.20 : x
  2. Step 2: Convert to fraction form
    428,519.03/642,859.79 = 172,371.20/x
  3. Step 3: Cross multiply
    428,519.03x = 642,859.79 × 172,371.20
  4. Step 4: Simplify right side
    428,519.03x = 110,810,509,357.89
  5. Step 5: Solve for x
    x = 110,810,509,357.89/428,519.03
  6. Step 6: Final answer
    x = 258,589.47

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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.