Home / 258,123.09-387,239.31-80,643.48

Finding the Fourth Proportional to 258,123.09, 387,239.31 and 80,643.48

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Solution

The fourth proportional to 258,123.09, 387,239.31 and 80,643.48 is: 120,982.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,123.09 : 387,239.31 = 80,643.48 : x
  2. Step 2: Convert to fraction form
    258,123.09/387,239.31 = 80,643.48/x
  3. Step 3: Cross multiply
    258,123.09x = 387,239.31 × 80,643.48
  4. Step 4: Simplify right side
    258,123.09x = 31,228,325,551.20
  5. Step 5: Solve for x
    x = 31,228,325,551.20/258,123.09
  6. Step 6: Final answer
    x = 120,982.30

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1.5x scale

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.