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Finding the Fourth Proportional to 258,492.68, 387,739.15 and 81,013.51

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Solution

The fourth proportional to 258,492.68, 387,739.15 and 81,013.51 is: 121,520.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,492.68 : 387,739.15 = 81,013.51 : x
  2. Step 2: Convert to fraction form
    258,492.68/387,739.15 = 81,013.51/x
  3. Step 3: Cross multiply
    258,492.68x = 387,739.15 × 81,013.51
  4. Step 4: Simplify right side
    258,492.68x = 31,412,108,334.03
  5. Step 5: Solve for x
    x = 31,412,108,334.03/258,492.68
  6. Step 6: Final answer
    x = 121,520.30

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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.