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Finding the Fourth Proportional to 258,192.72, 387,288 and 68,672.16

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Solution

The fourth proportional to 258,192.72, 387,288 and 68,672.16 is: 103,007.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,192.72 : 387,288 = 68,672.16 : x
  2. Step 2: Convert to fraction form
    258,192.72/387,288 = 68,672.16/x
  3. Step 3: Cross multiply
    258,192.72x = 387,288 × 68,672.16
  4. Step 4: Simplify right side
    258,192.72x = 26,595,903,502.08
  5. Step 5: Solve for x
    x = 26,595,903,502.08/258,192.72
  6. Step 6: Final answer
    x = 103,007.95

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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.