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Finding the Fourth Proportional to 76,361.20, 114,541.80 and 20,957.20

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Solution

The fourth proportional to 76,361.20, 114,541.80 and 20,957.20 is: 31,435.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,361.20 : 114,541.80 = 20,957.20 : x
  2. Step 2: Convert to fraction form
    76,361.20/114,541.80 = 20,957.20/x
  3. Step 3: Cross multiply
    76,361.20x = 114,541.80 × 20,957.20
  4. Step 4: Simplify right side
    76,361.20x = 2,400,475,410.96
  5. Step 5: Solve for x
    x = 2,400,475,410.96/76,361.20
  6. Step 6: Final answer
    x = 31,435.80

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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.