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Finding the Fourth Proportional to 85,742.80, 128,614.20 and 26,596.60

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Solution

The fourth proportional to 85,742.80, 128,614.20 and 26,596.60 is: 39,894.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,742.80 : 128,614.20 = 26,596.60 : x
  2. Step 2: Convert to fraction form
    85,742.80/128,614.20 = 26,596.60/x
  3. Step 3: Cross multiply
    85,742.80x = 128,614.20 × 26,596.60
  4. Step 4: Simplify right side
    85,742.80x = 3,420,700,431.72
  5. Step 5: Solve for x
    x = 3,420,700,431.72/85,742.80
  6. Step 6: Final answer
    x = 39,894.90

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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.