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Finding the Fourth Proportional to 11,428.56, 15,770.79 and 6,391.77

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Solution

The fourth proportional to 11,428.56, 15,770.79 and 6,391.77 is: 8,820.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,428.56 : 15,770.79 = 6,391.77 : x
  2. Step 2: Convert to fraction form
    11,428.56/15,770.79 = 6,391.77/x
  3. Step 3: Cross multiply
    11,428.56x = 15,770.79 × 6,391.77
  4. Step 4: Simplify right side
    11,428.56x = 100,803,262.40
  5. Step 5: Solve for x
    x = 100,803,262.40/11,428.56
  6. Step 6: Final answer
    x = 8,820.29

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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.