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Finding the Fourth Proportional to 258,395.78, 387,593.71 and 80,916.65

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Solution

The fourth proportional to 258,395.78, 387,593.71 and 80,916.65 is: 121,374.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,395.78 : 387,593.71 = 80,916.65 : x
  2. Step 2: Convert to fraction form
    258,395.78/387,593.71 = 80,916.65/x
  3. Step 3: Cross multiply
    258,395.78x = 387,593.71 × 80,916.65
  4. Step 4: Simplify right side
    258,395.78x = 31,362,783,887.49
  5. Step 5: Solve for x
    x = 31,362,783,887.49/258,395.78
  6. Step 6: Final answer
    x = 121,374.98

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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.