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Finding the Fourth Proportional to 639,129.60, 959,308.80 and 323,942.40

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Solution

The fourth proportional to 639,129.60, 959,308.80 and 323,942.40 is: 486,225.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,129.60 : 959,308.80 = 323,942.40 : x
  2. Step 2: Convert to fraction form
    639,129.60/959,308.80 = 323,942.40/x
  3. Step 3: Cross multiply
    639,129.60x = 959,308.80 × 323,942.40
  4. Step 4: Simplify right side
    639,129.60x = 310,760,795,013.12
  5. Step 5: Solve for x
    x = 310,760,795,013.12/639,129.60
  6. Step 6: Final answer
    x = 486,225.01

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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.