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Finding the Fourth Proportional to 639,431.72, 882,415.86 and 352,951.88

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Solution

The fourth proportional to 639,431.72, 882,415.86 and 352,951.88 is: 487,073.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,431.72 : 882,415.86 = 352,951.88 : x
  2. Step 2: Convert to fraction form
    639,431.72/882,415.86 = 352,951.88/x
  3. Step 3: Cross multiply
    639,431.72x = 882,415.86 × 352,951.88
  4. Step 4: Simplify right side
    639,431.72x = 311,450,336,728.82
  5. Step 5: Solve for x
    x = 311,450,336,728.82/639,431.72
  6. Step 6: Final answer
    x = 487,073.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.