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Finding the Fourth Proportional to 87,885, 121,287.78 and 54,357.48

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Solution

The fourth proportional to 87,885, 121,287.78 and 54,357.48 is: 75,017.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,885 : 121,287.78 = 54,357.48 : x
  2. Step 2: Convert to fraction form
    87,885/121,287.78 = 54,357.48/x
  3. Step 3: Cross multiply
    87,885x = 121,287.78 × 54,357.48
  4. Step 4: Simplify right side
    87,885x = 6,592,898,075.59
  5. Step 5: Solve for x
    x = 6,592,898,075.59/87,885
  6. Step 6: Final answer
    x = 75,017.33

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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.