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Finding the Fourth Proportional to 85,819.03, 128,728.64 and 35,871.80

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Solution

The fourth proportional to 85,819.03, 128,728.64 and 35,871.80 is: 53,807.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,819.03 : 128,728.64 = 35,871.80 : x
  2. Step 2: Convert to fraction form
    85,819.03/128,728.64 = 35,871.80/x
  3. Step 3: Cross multiply
    85,819.03x = 128,728.64 × 35,871.80
  4. Step 4: Simplify right side
    85,819.03x = 4,617,727,474.39
  5. Step 5: Solve for x
    x = 4,617,727,474.39/85,819.03
  6. Step 6: Final answer
    x = 53,807.73

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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.