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Finding the Fourth Proportional to 128,993.10, 193,545.10 and 66,707.34

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Solution

The fourth proportional to 128,993.10, 193,545.10 and 66,707.34 is: 100,089.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,993.10 : 193,545.10 = 66,707.34 : x
  2. Step 2: Convert to fraction form
    128,993.10/193,545.10 = 66,707.34/x
  3. Step 3: Cross multiply
    128,993.10x = 193,545.10 × 66,707.34
  4. Step 4: Simplify right side
    128,993.10x = 12,910,878,791.03
  5. Step 5: Solve for x
    x = 12,910,878,791.03/128,993.10
  6. Step 6: Final answer
    x = 100,089.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.