Home / 13,126.68-18,112.68-7,821.72

Finding the Fourth Proportional to 13,126.68, 18,112.68 and 7,821.72

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Solution

The fourth proportional to 13,126.68, 18,112.68 and 7,821.72 is: 10,792.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,126.68 : 18,112.68 = 7,821.72 : x
  2. Step 2: Convert to fraction form
    13,126.68/18,112.68 = 7,821.72/x
  3. Step 3: Cross multiply
    13,126.68x = 18,112.68 × 7,821.72
  4. Step 4: Simplify right side
    13,126.68x = 141,672,311.41
  5. Step 5: Solve for x
    x = 141,672,311.41/13,126.68
  6. Step 6: Final answer
    x = 10,792.70

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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.