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Finding the Fourth Proportional to 371,391.15, 512,521.88 and 218,435.79

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Solution

The fourth proportional to 371,391.15, 512,521.88 and 218,435.79 is: 301,442.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    371,391.15 : 512,521.88 = 218,435.79 : x
  2. Step 2: Convert to fraction form
    371,391.15/512,521.88 = 218,435.79/x
  3. Step 3: Cross multiply
    371,391.15x = 512,521.88 × 218,435.79
  4. Step 4: Simplify right side
    371,391.15x = 111,953,121,750.09
  5. Step 5: Solve for x
    x = 111,953,121,750.09/371,391.15
  6. Step 6: Final answer
    x = 301,442.62

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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.