Home / 258,619.43-387,928.85-81,140.13

Finding the Fourth Proportional to 258,619.43, 387,928.85 and 81,140.13

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Solution

The fourth proportional to 258,619.43, 387,928.85 and 81,140.13 is: 121,710.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,619.43 : 387,928.85 = 81,140.13 : x
  2. Step 2: Convert to fraction form
    258,619.43/387,928.85 = 81,140.13/x
  3. Step 3: Cross multiply
    258,619.43x = 387,928.85 × 81,140.13
  4. Step 4: Simplify right side
    258,619.43x = 31,476,596,914.05
  5. Step 5: Solve for x
    x = 31,476,596,914.05/258,619.43
  6. Step 6: Final answer
    x = 121,710.10

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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.