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Finding the Fourth Proportional to 12,809.76, 19,211.20 and 4,910.56

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Solution

The fourth proportional to 12,809.76, 19,211.20 and 4,910.56 is: 7,364.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,809.76 : 19,211.20 = 4,910.56 : x
  2. Step 2: Convert to fraction form
    12,809.76/19,211.20 = 4,910.56/x
  3. Step 3: Cross multiply
    12,809.76x = 19,211.20 × 4,910.56
  4. Step 4: Simplify right side
    12,809.76x = 94,337,750.27
  5. Step 5: Solve for x
    x = 94,337,750.27/12,809.76
  6. Step 6: Final answer
    x = 7,364.52

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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.