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Finding the Fourth Proportional to 18,994.08, 28,490.04 and 5,142

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Solution

The fourth proportional to 18,994.08, 28,490.04 and 5,142 is: 7,712.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,994.08 : 28,490.04 = 5,142 : x
  2. Step 2: Convert to fraction form
    18,994.08/28,490.04 = 5,142/x
  3. Step 3: Cross multiply
    18,994.08x = 28,490.04 × 5,142
  4. Step 4: Simplify right side
    18,994.08x = 146,495,785.68
  5. Step 5: Solve for x
    x = 146,495,785.68/18,994.08
  6. Step 6: Final answer
    x = 7,712.71

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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.