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Finding the Fourth Proportional to 258,418.08, 387,616.08 and 80,921.16

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Solution

The fourth proportional to 258,418.08, 387,616.08 and 80,921.16 is: 121,378.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,418.08 : 387,616.08 = 80,921.16 : x
  2. Step 2: Convert to fraction form
    258,418.08/387,616.08 = 80,921.16/x
  3. Step 3: Cross multiply
    258,418.08x = 387,616.08 × 80,921.16
  4. Step 4: Simplify right side
    258,418.08x = 31,366,342,828.25
  5. Step 5: Solve for x
    x = 31,366,342,828.25/258,418.08
  6. Step 6: Final answer
    x = 121,378.28

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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.