Home / 258,728.91-388,142.70-90,297.35

Finding the Fourth Proportional to 258,728.91, 388,142.70 and 90,297.35

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Solution

The fourth proportional to 258,728.91, 388,142.70 and 90,297.35 is: 135,463.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,728.91 : 388,142.70 = 90,297.35 : x
  2. Step 2: Convert to fraction form
    258,728.91/388,142.70 = 90,297.35/x
  3. Step 3: Cross multiply
    258,728.91x = 388,142.70 × 90,297.35
  4. Step 4: Simplify right side
    258,728.91x = 35,048,255,291.13
  5. Step 5: Solve for x
    x = 35,048,255,291.13/258,728.91
  6. Step 6: Final answer
    x = 135,463.24

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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.