Home / 128,972.84-193,397.18-100,821.56

Finding the Fourth Proportional to 128,972.84, 193,397.18 and 100,821.56

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Solution

The fourth proportional to 128,972.84, 193,397.18 and 100,821.56 is: 151,183.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,972.84 : 193,397.18 = 100,821.56 : x
  2. Step 2: Convert to fraction form
    128,972.84/193,397.18 = 100,821.56/x
  3. Step 3: Cross multiply
    128,972.84x = 193,397.18 × 100,821.56
  4. Step 4: Simplify right side
    128,972.84x = 19,498,605,387.20
  5. Step 5: Solve for x
    x = 19,498,605,387.20/128,972.84
  6. Step 6: Final answer
    x = 151,183.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.