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Finding the Fourth Proportional to 18,994.91, 28,492.38 and 5,143.91

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Solution

The fourth proportional to 18,994.91, 28,492.38 and 5,143.91 is: 7,715.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,994.91 : 28,492.38 = 5,143.91 : x
  2. Step 2: Convert to fraction form
    18,994.91/28,492.38 = 5,143.91/x
  3. Step 3: Cross multiply
    18,994.91x = 28,492.38 × 5,143.91
  4. Step 4: Simplify right side
    18,994.91x = 146,562,095.94
  5. Step 5: Solve for x
    x = 146,562,095.94/18,994.91
  6. Step 6: Final answer
    x = 7,715.86

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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.