Home / 258,518.52-387,782.64-81,021.60

Finding the Fourth Proportional to 258,518.52, 387,782.64 and 81,021.60

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Solution

The fourth proportional to 258,518.52, 387,782.64 and 81,021.60 is: 121,533.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,518.52 : 387,782.64 = 81,021.60 : x
  2. Step 2: Convert to fraction form
    258,518.52/387,782.64 = 81,021.60/x
  3. Step 3: Cross multiply
    258,518.52x = 387,782.64 × 81,021.60
  4. Step 4: Simplify right side
    258,518.52x = 31,418,769,945.02
  5. Step 5: Solve for x
    x = 31,418,769,945.02/258,518.52
  6. Step 6: Final answer
    x = 121,533.92

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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.