Home / 20,123.07-30,129.20-10,213.89

Finding the Fourth Proportional to 20,123.07, 30,129.20 and 10,213.89

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Solution

The fourth proportional to 20,123.07, 30,129.20 and 10,213.89 is: 15,292.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,123.07 : 30,129.20 = 10,213.89 : x
  2. Step 2: Convert to fraction form
    20,123.07/30,129.20 = 10,213.89/x
  3. Step 3: Cross multiply
    20,123.07x = 30,129.20 × 10,213.89
  4. Step 4: Simplify right side
    20,123.07x = 307,736,132.87
  5. Step 5: Solve for x
    x = 307,736,132.87/20,123.07
  6. Step 6: Final answer
    x = 15,292.70

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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.