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Finding the Fourth Proportional to 639,618.80, 882,675.25 and 353,139.44

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Solution

The fourth proportional to 639,618.80, 882,675.25 and 353,139.44 is: 487,333.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,618.80 : 882,675.25 = 353,139.44 : x
  2. Step 2: Convert to fraction form
    639,618.80/882,675.25 = 353,139.44/x
  3. Step 3: Cross multiply
    639,618.80x = 882,675.25 × 353,139.44
  4. Step 4: Simplify right side
    639,618.80x = 311,707,443,486.86
  5. Step 5: Solve for x
    x = 311,707,443,486.86/639,618.80
  6. Step 6: Final answer
    x = 487,333.15

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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.