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Finding the Fourth Proportional to 172,021.70, 237,401.61 and 129,512.90

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Solution

The fourth proportional to 172,021.70, 237,401.61 and 129,512.90 is: 178,736.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,021.70 : 237,401.61 = 129,512.90 : x
  2. Step 2: Convert to fraction form
    172,021.70/237,401.61 = 129,512.90/x
  3. Step 3: Cross multiply
    172,021.70x = 237,401.61 × 129,512.90
  4. Step 4: Simplify right side
    172,021.70x = 30,746,570,975.77
  5. Step 5: Solve for x
    x = 30,746,570,975.77/172,021.70
  6. Step 6: Final answer
    x = 178,736.58

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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.