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Finding the Fourth Proportional to 343,755.80, 515,633.70 and 320,427.80

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Solution

The fourth proportional to 343,755.80, 515,633.70 and 320,427.80 is: 480,641.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    343,755.80 : 515,633.70 = 320,427.80 : x
  2. Step 2: Convert to fraction form
    343,755.80/515,633.70 = 320,427.80/x
  3. Step 3: Cross multiply
    343,755.80x = 515,633.70 × 320,427.80
  4. Step 4: Simplify right side
    343,755.80x = 165,223,372,096.86
  5. Step 5: Solve for x
    x = 165,223,372,096.86/343,755.80
  6. Step 6: Final answer
    x = 480,641.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.