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Finding the Fourth Proportional to 315,487.80, 435,370.89 and 172,247.85

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Solution

The fourth proportional to 315,487.80, 435,370.89 and 172,247.85 is: 237,700.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,487.80 : 435,370.89 = 172,247.85 : x
  2. Step 2: Convert to fraction form
    315,487.80/435,370.89 = 172,247.85/x
  3. Step 3: Cross multiply
    315,487.80x = 435,370.89 × 172,247.85
  4. Step 4: Simplify right side
    315,487.80x = 74,991,699,755.09
  5. Step 5: Solve for x
    x = 74,991,699,755.09/315,487.80
  6. Step 6: Final answer
    x = 237,700.79

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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.