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Finding the Fourth Proportional to 258,472.23, 387,708.57 and 80,993.07

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Solution

The fourth proportional to 258,472.23, 387,708.57 and 80,993.07 is: 121,489.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,472.23 : 387,708.57 = 80,993.07 : x
  2. Step 2: Convert to fraction form
    258,472.23/387,708.57 = 80,993.07/x
  3. Step 3: Cross multiply
    258,472.23x = 387,708.57 × 80,993.07
  4. Step 4: Simplify right side
    258,472.23x = 31,401,707,349.61
  5. Step 5: Solve for x
    x = 31,401,707,349.61/258,472.23
  6. Step 6: Final answer
    x = 121,489.68

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1.5x scale

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.