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Finding the Fourth Proportional to 315,879.03, 435,912.30 and 172,640.10

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Solution

The fourth proportional to 315,879.03, 435,912.30 and 172,640.10 is: 238,242.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,879.03 : 435,912.30 = 172,640.10 : x
  2. Step 2: Convert to fraction form
    315,879.03/435,912.30 = 172,640.10/x
  3. Step 3: Cross multiply
    315,879.03x = 435,912.30 × 172,640.10
  4. Step 4: Simplify right side
    315,879.03x = 75,255,943,063.23
  5. Step 5: Solve for x
    x = 75,255,943,063.23/315,879.03
  6. Step 6: Final answer
    x = 238,242.92

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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.