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Finding the Fourth Proportional to 85,858.56, 128,765.97 and 26,663.76

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Solution

The fourth proportional to 85,858.56, 128,765.97 and 26,663.76 is: 39,988.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,858.56 : 128,765.97 = 26,663.76 : x
  2. Step 2: Convert to fraction form
    85,858.56/128,765.97 = 26,663.76/x
  3. Step 3: Cross multiply
    85,858.56x = 128,765.97 × 26,663.76
  4. Step 4: Simplify right side
    85,858.56x = 3,433,384,920.25
  5. Step 5: Solve for x
    x = 3,433,384,920.25/85,858.56
  6. Step 6: Final answer
    x = 39,988.85

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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.