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Finding the Fourth Proportional to 128,590.56, 177,793.45 and 112,629.11

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Solution

The fourth proportional to 128,590.56, 177,793.45 and 112,629.11 is: 155,724.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,590.56 : 177,793.45 = 112,629.11 : x
  2. Step 2: Convert to fraction form
    128,590.56/177,793.45 = 112,629.11/x
  3. Step 3: Cross multiply
    128,590.56x = 177,793.45 × 112,629.11
  4. Step 4: Simplify right side
    128,590.56x = 20,024,716,866.79
  5. Step 5: Solve for x
    x = 20,024,716,866.79/128,590.56
  6. Step 6: Final answer
    x = 155,724.63

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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.