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Finding the Fourth Proportional to 18,731.84, 28,097.64 and 10,989.76

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Solution

The fourth proportional to 18,731.84, 28,097.64 and 10,989.76 is: 16,484.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,731.84 : 28,097.64 = 10,989.76 : x
  2. Step 2: Convert to fraction form
    18,731.84/28,097.64 = 10,989.76/x
  3. Step 3: Cross multiply
    18,731.84x = 28,097.64 × 10,989.76
  4. Step 4: Simplify right side
    18,731.84x = 308,786,320.17
  5. Step 5: Solve for x
    x = 308,786,320.17/18,731.84
  6. Step 6: Final answer
    x = 16,484.57

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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.