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Finding the Fourth Proportional to 258,112, 387,182.58 and 91,900

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Solution

The fourth proportional to 258,112, 387,182.58 and 91,900 is: 137,855.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,112 : 387,182.58 = 91,900 : x
  2. Step 2: Convert to fraction form
    258,112/387,182.58 = 91,900/x
  3. Step 3: Cross multiply
    258,112x = 387,182.58 × 91,900
  4. Step 4: Simplify right side
    258,112x = 35,582,079,102
  5. Step 5: Solve for x
    x = 35,582,079,102/258,112
  6. Step 6: Final answer
    x = 137,855.19

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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.