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Finding the Fourth Proportional to 128,306.64, 177,055.99 and 70,942.64

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Solution

The fourth proportional to 128,306.64, 177,055.99 and 70,942.64 is: 97,896.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,306.64 : 177,055.99 = 70,942.64 : x
  2. Step 2: Convert to fraction form
    128,306.64/177,055.99 = 70,942.64/x
  3. Step 3: Cross multiply
    128,306.64x = 177,055.99 × 70,942.64
  4. Step 4: Simplify right side
    128,306.64x = 12,560,819,358.41
  5. Step 5: Solve for x
    x = 12,560,819,358.41/128,306.64
  6. Step 6: Final answer
    x = 97,896.88

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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.