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Finding the Fourth Proportional to 639,636.55, 882,712.20 and 353,174.74

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Solution

The fourth proportional to 639,636.55, 882,712.20 and 353,174.74 is: 487,388.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,636.55 : 882,712.20 = 353,174.74 : x
  2. Step 2: Convert to fraction form
    639,636.55/882,712.20 = 353,174.74/x
  3. Step 3: Cross multiply
    639,636.55x = 882,712.20 × 353,174.74
  4. Step 4: Simplify right side
    639,636.55x = 311,751,651,729.83
  5. Step 5: Solve for x
    x = 311,751,651,729.83/639,636.55
  6. Step 6: Final answer
    x = 487,388.74

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1.5x scale

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.