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Finding the Fourth Proportional to 426,205.80, 639,999.90 and 308,701.80

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Solution

The fourth proportional to 426,205.80, 639,999.90 and 308,701.80 is: 463,553.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,205.80 : 639,999.90 = 308,701.80 : x
  2. Step 2: Convert to fraction form
    426,205.80/639,999.90 = 308,701.80/x
  3. Step 3: Cross multiply
    426,205.80x = 639,999.90 × 308,701.80
  4. Step 4: Simplify right side
    426,205.80x = 197,569,121,129.82
  5. Step 5: Solve for x
    x = 197,569,121,129.82/426,205.80
  6. Step 6: Final answer
    x = 463,553.34

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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.