Home / 258,985.08-388,440.72-81,487.48

Finding the Fourth Proportional to 258,985.08, 388,440.72 and 81,487.48

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Solution

The fourth proportional to 258,985.08, 388,440.72 and 81,487.48 is: 122,219.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,985.08 : 388,440.72 = 81,487.48 : x
  2. Step 2: Convert to fraction form
    258,985.08/388,440.72 = 81,487.48/x
  3. Step 3: Cross multiply
    258,985.08x = 388,440.72 × 81,487.48
  4. Step 4: Simplify right side
    258,985.08x = 31,653,055,887.74
  5. Step 5: Solve for x
    x = 31,653,055,887.74/258,985.08
  6. Step 6: Final answer
    x = 122,219.61

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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.