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Finding the Fourth Proportional to 389,990.62, 585,021.63 and 109,505.98

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Solution

The fourth proportional to 389,990.62, 585,021.63 and 109,505.98 is: 164,268.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,990.62 : 585,021.63 = 109,505.98 : x
  2. Step 2: Convert to fraction form
    389,990.62/585,021.63 = 109,505.98/x
  3. Step 3: Cross multiply
    389,990.62x = 585,021.63 × 109,505.98
  4. Step 4: Simplify right side
    389,990.62x = 64,063,366,914.35
  5. Step 5: Solve for x
    x = 64,063,366,914.35/389,990.62
  6. Step 6: Final answer
    x = 164,268.99

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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.