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Finding the Fourth Proportional to 128,208.52, 175,986.05 and 113,745.16

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Solution

The fourth proportional to 128,208.52, 175,986.05 and 113,745.16 is: 156,132.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,208.52 : 175,986.05 = 113,745.16 : x
  2. Step 2: Convert to fraction form
    128,208.52/175,986.05 = 113,745.16/x
  3. Step 3: Cross multiply
    128,208.52x = 175,986.05 × 113,745.16
  4. Step 4: Simplify right side
    128,208.52x = 20,017,561,415.02
  5. Step 5: Solve for x
    x = 20,017,561,415.02/128,208.52
  6. Step 6: Final answer
    x = 156,132.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.