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Finding the Fourth Proportional to 258,521.02, 387,786.39 and 81,024.10

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Solution

The fourth proportional to 258,521.02, 387,786.39 and 81,024.10 is: 121,537.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,521.02 : 387,786.39 = 81,024.10 : x
  2. Step 2: Convert to fraction form
    258,521.02/387,786.39 = 81,024.10/x
  3. Step 3: Cross multiply
    258,521.02x = 387,786.39 × 81,024.10
  4. Step 4: Simplify right side
    258,521.02x = 31,420,043,242.00
  5. Step 5: Solve for x
    x = 31,420,043,242.00/258,521.02
  6. Step 6: Final answer
    x = 121,537.67

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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.