Home / 258,715.72-388,138.16-90,238.46

Finding the Fourth Proportional to 258,715.72, 388,138.16 and 90,238.46

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Solution

The fourth proportional to 258,715.72, 388,138.16 and 90,238.46 is: 135,380.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,715.72 : 388,138.16 = 90,238.46 : x
  2. Step 2: Convert to fraction form
    258,715.72/388,138.16 = 90,238.46/x
  3. Step 3: Cross multiply
    258,715.72x = 388,138.16 × 90,238.46
  4. Step 4: Simplify right side
    258,715.72x = 35,024,989,825.63
  5. Step 5: Solve for x
    x = 35,024,989,825.63/258,715.72
  6. Step 6: Final answer
    x = 135,380.22

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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.