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Finding the Fourth Proportional to 57,765.50, 86,648.61 and 20,829.50

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Solution

The fourth proportional to 57,765.50, 86,648.61 and 20,829.50 is: 31,244.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,765.50 : 86,648.61 = 20,829.50 : x
  2. Step 2: Convert to fraction form
    57,765.50/86,648.61 = 20,829.50/x
  3. Step 3: Cross multiply
    57,765.50x = 86,648.61 × 20,829.50
  4. Step 4: Simplify right side
    57,765.50x = 1,804,847,222.00
  5. Step 5: Solve for x
    x = 1,804,847,222.00/57,765.50
  6. Step 6: Final answer
    x = 31,244.38

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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.