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Finding the Fourth Proportional to 258,536.60, 387,805.01 and 81,057.45

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Solution

The fourth proportional to 258,536.60, 387,805.01 and 81,057.45 is: 121,586.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,536.60 : 387,805.01 = 81,057.45 : x
  2. Step 2: Convert to fraction form
    258,536.60/387,805.01 = 81,057.45/x
  3. Step 3: Cross multiply
    258,536.60x = 387,805.01 × 81,057.45
  4. Step 4: Simplify right side
    258,536.60x = 31,434,483,268.80
  5. Step 5: Solve for x
    x = 31,434,483,268.80/258,536.60
  6. Step 6: Final answer
    x = 121,586.20

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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.