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Finding the Fourth Proportional to 128,687.76, 177,588.99 and 72,099.54

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Solution

The fourth proportional to 128,687.76, 177,588.99 and 72,099.54 is: 99,497.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,687.76 : 177,588.99 = 72,099.54 : x
  2. Step 2: Convert to fraction form
    128,687.76/177,588.99 = 72,099.54/x
  3. Step 3: Cross multiply
    128,687.76x = 177,588.99 × 72,099.54
  4. Step 4: Simplify right side
    128,687.76x = 12,804,084,488.06
  5. Step 5: Solve for x
    x = 12,804,084,488.06/128,687.76
  6. Step 6: Final answer
    x = 99,497.30

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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.