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Finding the Fourth Proportional to 120,455.76, 180,745.32 and 57,347.28

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Solution

The fourth proportional to 120,455.76, 180,745.32 and 57,347.28 is: 86,050.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,455.76 : 180,745.32 = 57,347.28 : x
  2. Step 2: Convert to fraction form
    120,455.76/180,745.32 = 57,347.28/x
  3. Step 3: Cross multiply
    120,455.76x = 180,745.32 × 57,347.28
  4. Step 4: Simplify right side
    120,455.76x = 10,365,252,474.73
  5. Step 5: Solve for x
    x = 10,365,252,474.73/120,455.76
  6. Step 6: Final answer
    x = 86,050.28

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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.