Home / 128,664.84-177,624.69-99,920.01

Finding the Fourth Proportional to 128,664.84, 177,624.69 and 99,920.01

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Solution

The fourth proportional to 128,664.84, 177,624.69 and 99,920.01 is: 137,941.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,664.84 : 177,624.69 = 99,920.01 : x
  2. Step 2: Convert to fraction form
    128,664.84/177,624.69 = 99,920.01/x
  3. Step 3: Cross multiply
    128,664.84x = 177,624.69 × 99,920.01
  4. Step 4: Simplify right side
    128,664.84x = 17,748,260,801.05
  5. Step 5: Solve for x
    x = 17,748,260,801.05/128,664.84
  6. Step 6: Final answer
    x = 137,941.81

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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.