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Finding the Fourth Proportional to 389,709.18, 584,580.78 and 123,489.33

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Solution

The fourth proportional to 389,709.18, 584,580.78 and 123,489.33 is: 185,239.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,709.18 : 584,580.78 = 123,489.33 : x
  2. Step 2: Convert to fraction form
    389,709.18/584,580.78 = 123,489.33/x
  3. Step 3: Cross multiply
    389,709.18x = 584,580.78 × 123,489.33
  4. Step 4: Simplify right side
    389,709.18x = 72,189,488,853.08
  5. Step 5: Solve for x
    x = 72,189,488,853.08/389,709.18
  6. Step 6: Final answer
    x = 185,239.39

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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.