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Finding the Fourth Proportional to 128,792.96, 177,738 and 72,205.28

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Solution

The fourth proportional to 128,792.96, 177,738 and 72,205.28 is: 99,645.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,792.96 : 177,738 = 72,205.28 : x
  2. Step 2: Convert to fraction form
    128,792.96/177,738 = 72,205.28/x
  3. Step 3: Cross multiply
    128,792.96x = 177,738 × 72,205.28
  4. Step 4: Simplify right side
    128,792.96x = 12,833,622,056.64
  5. Step 5: Solve for x
    x = 12,833,622,056.64/128,792.96
  6. Step 6: Final answer
    x = 99,645.37

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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.