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Finding the Fourth Proportional to 389,989.12, 585,019.38 and 109,504.48

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Solution

The fourth proportional to 389,989.12, 585,019.38 and 109,504.48 is: 164,266.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,989.12 : 585,019.38 = 109,504.48 : x
  2. Step 2: Convert to fraction form
    389,989.12/585,019.38 = 109,504.48/x
  3. Step 3: Cross multiply
    389,989.12x = 585,019.38 × 109,504.48
  4. Step 4: Simplify right side
    389,989.12x = 64,062,242,996.82
  5. Step 5: Solve for x
    x = 64,062,242,996.82/389,989.12
  6. Step 6: Final answer
    x = 164,266.74

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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.