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Finding the Fourth Proportional to 343,408.12, 515,101.20 and 90,680.80

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Solution

The fourth proportional to 343,408.12, 515,101.20 and 90,680.80 is: 136,018.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    343,408.12 : 515,101.20 = 90,680.80 : x
  2. Step 2: Convert to fraction form
    343,408.12/515,101.20 = 90,680.80/x
  3. Step 3: Cross multiply
    343,408.12x = 515,101.20 × 90,680.80
  4. Step 4: Simplify right side
    343,408.12x = 46,709,788,896.96
  5. Step 5: Solve for x
    x = 46,709,788,896.96/343,408.12
  6. Step 6: Final answer
    x = 136,018.30

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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.