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Finding the Fourth Proportional to 258,563.40, 387,845.01 and 81,084.03

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Solution

The fourth proportional to 258,563.40, 387,845.01 and 81,084.03 is: 121,626.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,563.40 : 387,845.01 = 81,084.03 : x
  2. Step 2: Convert to fraction form
    258,563.40/387,845.01 = 81,084.03/x
  3. Step 3: Cross multiply
    258,563.40x = 387,845.01 × 81,084.03
  4. Step 4: Simplify right side
    258,563.40x = 31,448,036,426.19
  5. Step 5: Solve for x
    x = 31,448,036,426.19/258,563.40
  6. Step 6: Final answer
    x = 121,626.02

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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.