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Finding the Fourth Proportional to 639,458.12, 882,459.48 and 352,978.34

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Solution

The fourth proportional to 639,458.12, 882,459.48 and 352,978.34 is: 487,114.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,458.12 : 882,459.48 = 352,978.34 : x
  2. Step 2: Convert to fraction form
    639,458.12/882,459.48 = 352,978.34/x
  3. Step 3: Cross multiply
    639,458.12x = 882,459.48 × 352,978.34
  4. Step 4: Simplify right side
    639,458.12x = 311,489,082,367.66
  5. Step 5: Solve for x
    x = 311,489,082,367.66/639,458.12
  6. Step 6: Final answer
    x = 487,114.12

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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.