Home / 258,716.35-388,139.12-90,239.10

Finding the Fourth Proportional to 258,716.35, 388,139.12 and 90,239.10

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Solution

The fourth proportional to 258,716.35, 388,139.12 and 90,239.10 is: 135,381.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,716.35 : 388,139.12 = 90,239.10 : x
  2. Step 2: Convert to fraction form
    258,716.35/388,139.12 = 90,239.10/x
  3. Step 3: Cross multiply
    258,716.35x = 388,139.12 × 90,239.10
  4. Step 4: Simplify right side
    258,716.35x = 35,025,324,863.59
  5. Step 5: Solve for x
    x = 35,025,324,863.59/258,716.35
  6. Step 6: Final answer
    x = 135,381.18

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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.