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Finding the Fourth Proportional to 120,859.28, 166,788.77 and 66,411.00

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Solution

The fourth proportional to 120,859.28, 166,788.77 and 66,411.00 is: 91,648.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,859.28 : 166,788.77 = 66,411.00 : x
  2. Step 2: Convert to fraction form
    120,859.28/166,788.77 = 66,411.00/x
  3. Step 3: Cross multiply
    120,859.28x = 166,788.77 × 66,411.00
  4. Step 4: Simplify right side
    120,859.28x = 11,076,609,280.52
  5. Step 5: Solve for x
    x = 11,076,609,280.52/120,859.28
  6. Step 6: Final answer
    x = 91,648.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.