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Finding the Fourth Proportional to 386,128.69, 579,186.82 and 119,889.46

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Solution

The fourth proportional to 386,128.69, 579,186.82 and 119,889.46 is: 179,832.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,128.69 : 579,186.82 = 119,889.46 : x
  2. Step 2: Convert to fraction form
    386,128.69/579,186.82 = 119,889.46/x
  3. Step 3: Cross multiply
    386,128.69x = 579,186.82 × 119,889.46
  4. Step 4: Simplify right side
    386,128.69x = 69,438,395,088.92
  5. Step 5: Solve for x
    x = 69,438,395,088.92/386,128.69
  6. Step 6: Final answer
    x = 179,832.26

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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.