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Finding the Fourth Proportional to 258,479.61, 387,719.55 and 81,000.51

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Solution

The fourth proportional to 258,479.61, 387,719.55 and 81,000.51 is: 121,500.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,479.61 : 387,719.55 = 81,000.51 : x
  2. Step 2: Convert to fraction form
    258,479.61/387,719.55 = 81,000.51/x
  3. Step 3: Cross multiply
    258,479.61x = 387,719.55 × 81,000.51
  4. Step 4: Simplify right side
    258,479.61x = 31,405,481,286.97
  5. Step 5: Solve for x
    x = 31,405,481,286.97/258,479.61
  6. Step 6: Final answer
    x = 121,500.81

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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.