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Finding the Fourth Proportional to 489,185.40, 674,789.86 and 307,609.86

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Solution

The fourth proportional to 489,185.40, 674,789.86 and 307,609.86 is: 424,321.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,185.40 : 674,789.86 = 307,609.86 : x
  2. Step 2: Convert to fraction form
    489,185.40/674,789.86 = 307,609.86/x
  3. Step 3: Cross multiply
    489,185.40x = 674,789.86 × 307,609.86
  4. Step 4: Simplify right side
    489,185.40x = 207,572,014,364.02
  5. Step 5: Solve for x
    x = 207,572,014,364.02/489,185.40
  6. Step 6: Final answer
    x = 424,321.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.