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Finding the Fourth Proportional to 85,866.10, 128,799.15 and 76,680.70

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Solution

The fourth proportional to 85,866.10, 128,799.15 and 76,680.70 is: 115,021.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,866.10 : 128,799.15 = 76,680.70 : x
  2. Step 2: Convert to fraction form
    85,866.10/128,799.15 = 76,680.70/x
  3. Step 3: Cross multiply
    85,866.10x = 128,799.15 × 76,680.70
  4. Step 4: Simplify right side
    85,866.10x = 9,876,408,981.41
  5. Step 5: Solve for x
    x = 9,876,408,981.41/85,866.10
  6. Step 6: Final answer
    x = 115,021.05

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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.