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Finding the Fourth Proportional to 85,676.10, 128,514.15 and 76,344.90

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Solution

The fourth proportional to 85,676.10, 128,514.15 and 76,344.90 is: 114,517.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,676.10 : 128,514.15 = 76,344.90 : x
  2. Step 2: Convert to fraction form
    85,676.10/128,514.15 = 76,344.90/x
  3. Step 3: Cross multiply
    85,676.10x = 128,514.15 × 76,344.90
  4. Step 4: Simplify right side
    85,676.10x = 9,811,399,930.34
  5. Step 5: Solve for x
    x = 9,811,399,930.34/85,676.10
  6. Step 6: Final answer
    x = 114,517.35

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1.5x scale

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.