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Finding the Fourth Proportional to 85,388.40, 128,082.60 and 57,321.90

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Solution

The fourth proportional to 85,388.40, 128,082.60 and 57,321.90 is: 85,982.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,388.40 : 128,082.60 = 57,321.90 : x
  2. Step 2: Convert to fraction form
    85,388.40/128,082.60 = 57,321.90/x
  3. Step 3: Cross multiply
    85,388.40x = 128,082.60 × 57,321.90
  4. Step 4: Simplify right side
    85,388.40x = 7,341,937,988.94
  5. Step 5: Solve for x
    x = 7,341,937,988.94/85,388.40
  6. Step 6: Final answer
    x = 85,982.85

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.