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Finding the Fourth Proportional to 128,719.56, 177,630.48 and 70,575.60

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Solution

The fourth proportional to 128,719.56, 177,630.48 and 70,575.60 is: 97,392.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,719.56 : 177,630.48 = 70,575.60 : x
  2. Step 2: Convert to fraction form
    128,719.56/177,630.48 = 70,575.60/x
  3. Step 3: Cross multiply
    128,719.56x = 177,630.48 × 70,575.60
  4. Step 4: Simplify right side
    128,719.56x = 12,536,377,704.29
  5. Step 5: Solve for x
    x = 12,536,377,704.29/128,719.56
  6. Step 6: Final answer
    x = 97,392.95

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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.