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Finding the Fourth Proportional to 315,791.18, 435,786.64 and 172,548.15

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Solution

The fourth proportional to 315,791.18, 435,786.64 and 172,548.15 is: 238,113.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,791.18 : 435,786.64 = 172,548.15 : x
  2. Step 2: Convert to fraction form
    315,791.18/435,786.64 = 172,548.15/x
  3. Step 3: Cross multiply
    315,791.18x = 435,786.64 × 172,548.15
  4. Step 4: Simplify right side
    315,791.18x = 75,194,178,526.72
  5. Step 5: Solve for x
    x = 75,194,178,526.72/315,791.18
  6. Step 6: Final answer
    x = 238,113.61

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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.