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Finding the Fourth Proportional to 128,992.04, 178,019.82 and 75,280.56

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Solution

The fourth proportional to 128,992.04, 178,019.82 and 75,280.56 is: 103,893.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,992.04 : 178,019.82 = 75,280.56 : x
  2. Step 2: Convert to fraction form
    128,992.04/178,019.82 = 75,280.56/x
  3. Step 3: Cross multiply
    128,992.04x = 178,019.82 × 75,280.56
  4. Step 4: Simplify right side
    128,992.04x = 13,401,431,740.70
  5. Step 5: Solve for x
    x = 13,401,431,740.70/128,992.04
  6. Step 6: Final answer
    x = 103,893.48

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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.