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Finding the Fourth Proportional to 128,710.72, 177,625.60 and 72,120

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Solution

The fourth proportional to 128,710.72, 177,625.60 and 72,120 is: 99,528.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,710.72 : 177,625.60 = 72,120 : x
  2. Step 2: Convert to fraction form
    128,710.72/177,625.60 = 72,120/x
  3. Step 3: Cross multiply
    128,710.72x = 177,625.60 × 72,120
  4. Step 4: Simplify right side
    128,710.72x = 12,810,358,272
  5. Step 5: Solve for x
    x = 12,810,358,272/128,710.72
  6. Step 6: Final answer
    x = 99,528.29

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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.