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Finding the Fourth Proportional to 128,307, 177,055.95 and 70,942.87

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Solution

The fourth proportional to 128,307, 177,055.95 and 70,942.87 is: 97,896.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,307 : 177,055.95 = 70,942.87 : x
  2. Step 2: Convert to fraction form
    128,307/177,055.95 = 70,942.87/x
  3. Step 3: Cross multiply
    128,307x = 177,055.95 × 70,942.87
  4. Step 4: Simplify right side
    128,307x = 12,560,857,243.58
  5. Step 5: Solve for x
    x = 12,560,857,243.58/128,307
  6. Step 6: Final answer
    x = 97,896.90

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1.5x scale

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.