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Finding the Fourth Proportional to 18,994.64, 28,491.96 and 5,145.68

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Solution

The fourth proportional to 18,994.64, 28,491.96 and 5,145.68 is: 7,718.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,994.64 : 28,491.96 = 5,145.68 : x
  2. Step 2: Convert to fraction form
    18,994.64/28,491.96 = 5,145.68/x
  3. Step 3: Cross multiply
    18,994.64x = 28,491.96 × 5,145.68
  4. Step 4: Simplify right side
    18,994.64x = 146,610,508.73
  5. Step 5: Solve for x
    x = 146,610,508.73/18,994.64
  6. Step 6: Final answer
    x = 7,718.52

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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.