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Finding the Fourth Proportional to 395,187, 545,371.74 and 216,339

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Solution

The fourth proportional to 395,187, 545,371.74 and 216,339 is: 298,555.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    395,187 : 545,371.74 = 216,339 : x
  2. Step 2: Convert to fraction form
    395,187/545,371.74 = 216,339/x
  3. Step 3: Cross multiply
    395,187x = 545,371.74 × 216,339
  4. Step 4: Simplify right side
    395,187x = 117,985,176,859.86
  5. Step 5: Solve for x
    x = 117,985,176,859.86/395,187
  6. Step 6: Final answer
    x = 298,555.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.