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Finding the Fourth Proportional to 258,479.48, 387,719.36 and 81,000.38

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Solution

The fourth proportional to 258,479.48, 387,719.36 and 81,000.38 is: 121,500.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,479.48 : 387,719.36 = 81,000.38 : x
  2. Step 2: Convert to fraction form
    258,479.48/387,719.36 = 81,000.38/x
  3. Step 3: Cross multiply
    258,479.48x = 387,719.36 × 81,000.38
  4. Step 4: Simplify right side
    258,479.48x = 31,405,415,493.36
  5. Step 5: Solve for x
    x = 31,405,415,493.36/258,479.48
  6. Step 6: Final answer
    x = 121,500.61

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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.