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Finding the Fourth Proportional to 85,921.20, 128,891.40 and 26,756.40

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Solution

The fourth proportional to 85,921.20, 128,891.40 and 26,756.40 is: 40,137.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,921.20 : 128,891.40 = 26,756.40 : x
  2. Step 2: Convert to fraction form
    85,921.20/128,891.40 = 26,756.40/x
  3. Step 3: Cross multiply
    85,921.20x = 128,891.40 × 26,756.40
  4. Step 4: Simplify right side
    85,921.20x = 3,448,669,854.96
  5. Step 5: Solve for x
    x = 3,448,669,854.96/85,921.20
  6. Step 6: Final answer
    x = 40,137.59

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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.