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Finding the Fourth Proportional to 315,880.89, 435,914.58 and 172,640.89

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Solution

The fourth proportional to 315,880.89, 435,914.58 and 172,640.89 is: 238,243.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,880.89 : 435,914.58 = 172,640.89 : x
  2. Step 2: Convert to fraction form
    315,880.89/435,914.58 = 172,640.89/x
  3. Step 3: Cross multiply
    315,880.89x = 435,914.58 × 172,640.89
  4. Step 4: Simplify right side
    315,880.89x = 75,256,680,191.97
  5. Step 5: Solve for x
    x = 75,256,680,191.97/315,880.89
  6. Step 6: Final answer
    x = 238,243.85

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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.