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Finding the Fourth Proportional to 57,720.40, 86,580.60 and 45,910.60

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Solution

The fourth proportional to 57,720.40, 86,580.60 and 45,910.60 is: 68,865.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,720.40 : 86,580.60 = 45,910.60 : x
  2. Step 2: Convert to fraction form
    57,720.40/86,580.60 = 45,910.60/x
  3. Step 3: Cross multiply
    57,720.40x = 86,580.60 × 45,910.60
  4. Step 4: Simplify right side
    57,720.40x = 3,974,967,294.36
  5. Step 5: Solve for x
    x = 3,974,967,294.36/57,720.40
  6. Step 6: Final answer
    x = 68,865.90

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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.