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Finding the Fourth Proportional to 85,910.64, 128,869.20 and 26,751.48

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Solution

The fourth proportional to 85,910.64, 128,869.20 and 26,751.48 is: 40,128.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,910.64 : 128,869.20 = 26,751.48 : x
  2. Step 2: Convert to fraction form
    85,910.64/128,869.20 = 26,751.48/x
  3. Step 3: Cross multiply
    85,910.64x = 128,869.20 × 26,751.48
  4. Step 4: Simplify right side
    85,910.64x = 3,447,441,826.42
  5. Step 5: Solve for x
    x = 3,447,441,826.42/85,910.64
  6. Step 6: Final answer
    x = 40,128.23

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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.