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Finding the Fourth Proportional to 258,563.70, 387,845.55 and 81,085.02

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Solution

The fourth proportional to 258,563.70, 387,845.55 and 81,085.02 is: 121,627.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,563.70 : 387,845.55 = 81,085.02 : x
  2. Step 2: Convert to fraction form
    258,563.70/387,845.55 = 81,085.02/x
  3. Step 3: Cross multiply
    258,563.70x = 387,845.55 × 81,085.02
  4. Step 4: Simplify right side
    258,563.70x = 31,448,464,178.66
  5. Step 5: Solve for x
    x = 31,448,464,178.66/258,563.70
  6. Step 6: Final answer
    x = 121,627.53

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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.