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Finding the Fourth Proportional to 427,092.48, 640,638.63 and 391,453.61

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Solution

The fourth proportional to 427,092.48, 640,638.63 and 391,453.61 is: 587,180.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,092.48 : 640,638.63 = 391,453.61 : x
  2. Step 2: Convert to fraction form
    427,092.48/640,638.63 = 391,453.61/x
  3. Step 3: Cross multiply
    427,092.48x = 640,638.63 × 391,453.61
  4. Step 4: Simplify right side
    427,092.48x = 250,780,301,215.76
  5. Step 5: Solve for x
    x = 250,780,301,215.76/427,092.48
  6. Step 6: Final answer
    x = 587,180.33

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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.