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Finding the Fourth Proportional to 428,236.46, 642,304.64 and 172,058.65

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Solution

The fourth proportional to 428,236.46, 642,304.64 and 172,058.65 is: 258,067.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,236.46 : 642,304.64 = 172,058.65 : x
  2. Step 2: Convert to fraction form
    428,236.46/642,304.64 = 172,058.65/x
  3. Step 3: Cross multiply
    428,236.46x = 642,304.64 × 172,058.65
  4. Step 4: Simplify right side
    428,236.46x = 110,514,069,247.14
  5. Step 5: Solve for x
    x = 110,514,069,247.14/428,236.46
  6. Step 6: Final answer
    x = 258,067.87

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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.