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Finding the Fourth Proportional to 85,930.70, 128,905.65 and 26,765.90

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Solution

The fourth proportional to 85,930.70, 128,905.65 and 26,765.90 is: 40,151.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,930.70 : 128,905.65 = 26,765.90 : x
  2. Step 2: Convert to fraction form
    85,930.70/128,905.65 = 26,765.90/x
  3. Step 3: Cross multiply
    85,930.70x = 128,905.65 × 26,765.90
  4. Step 4: Simplify right side
    85,930.70x = 3,450,275,737.34
  5. Step 5: Solve for x
    x = 3,450,275,737.34/85,930.70
  6. Step 6: Final answer
    x = 40,151.84

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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.