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Finding the Fourth Proportional to 128,052.20, 176,629.56 and 77,751.20

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Solution

The fourth proportional to 128,052.20, 176,629.56 and 77,751.20 is: 107,246.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,052.20 : 176,629.56 = 77,751.20 : x
  2. Step 2: Convert to fraction form
    128,052.20/176,629.56 = 77,751.20/x
  3. Step 3: Cross multiply
    128,052.20x = 176,629.56 × 77,751.20
  4. Step 4: Simplify right side
    128,052.20x = 13,733,160,245.47
  5. Step 5: Solve for x
    x = 13,733,160,245.47/128,052.20
  6. Step 6: Final answer
    x = 107,246.58

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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.