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Finding the Fourth Proportional to 85,978.21, 128,847.18 and 73,261.54

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Solution

The fourth proportional to 85,978.21, 128,847.18 and 73,261.54 is: 109,789.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,978.21 : 128,847.18 = 73,261.54 : x
  2. Step 2: Convert to fraction form
    85,978.21/128,847.18 = 73,261.54/x
  3. Step 3: Cross multiply
    85,978.21x = 128,847.18 × 73,261.54
  4. Step 4: Simplify right side
    85,978.21x = 9,439,542,831.46
  5. Step 5: Solve for x
    x = 9,439,542,831.46/85,978.21
  6. Step 6: Final answer
    x = 109,789.94

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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.