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Finding the Fourth Proportional to 128,801.28, 177,745.76 and 72,212.64

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Solution

The fourth proportional to 128,801.28, 177,745.76 and 72,212.64 is: 99,653.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,801.28 : 177,745.76 = 72,212.64 : x
  2. Step 2: Convert to fraction form
    128,801.28/177,745.76 = 72,212.64/x
  3. Step 3: Cross multiply
    128,801.28x = 177,745.76 × 72,212.64
  4. Step 4: Simplify right side
    128,801.28x = 12,835,490,578.41
  5. Step 5: Solve for x
    x = 12,835,490,578.41/128,801.28
  6. Step 6: Final answer
    x = 99,653.44

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1.5x scale

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.