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Finding the Fourth Proportional to 12,955.76, 19,420.80 and 6,722.72

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Solution

The fourth proportional to 12,955.76, 19,420.80 and 6,722.72 is: 10,077.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,955.76 : 19,420.80 = 6,722.72 : x
  2. Step 2: Convert to fraction form
    12,955.76/19,420.80 = 6,722.72/x
  3. Step 3: Cross multiply
    12,955.76x = 19,420.80 × 6,722.72
  4. Step 4: Simplify right side
    12,955.76x = 130,560,600.58
  5. Step 5: Solve for x
    x = 130,560,600.58/12,955.76
  6. Step 6: Final answer
    x = 10,077.42

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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.