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Finding the Fourth Proportional to 258,572.54, 387,858.90 and 81,095.06

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Solution

The fourth proportional to 258,572.54, 387,858.90 and 81,095.06 is: 121,642.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,572.54 : 387,858.90 = 81,095.06 : x
  2. Step 2: Convert to fraction form
    258,572.54/387,858.90 = 81,095.06/x
  3. Step 3: Cross multiply
    258,572.54x = 387,858.90 × 81,095.06
  4. Step 4: Simplify right side
    258,572.54x = 31,453,440,767.03
  5. Step 5: Solve for x
    x = 31,453,440,767.03/258,572.54
  6. Step 6: Final answer
    x = 121,642.62

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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.