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Finding the Fourth Proportional to 18,729.84, 28,094.64 and 10,987.76

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Solution

The fourth proportional to 18,729.84, 28,094.64 and 10,987.76 is: 16,481.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,729.84 : 28,094.64 = 10,987.76 : x
  2. Step 2: Convert to fraction form
    18,729.84/28,094.64 = 10,987.76/x
  3. Step 3: Cross multiply
    18,729.84x = 28,094.64 × 10,987.76
  4. Step 4: Simplify right side
    18,729.84x = 308,697,161.61
  5. Step 5: Solve for x
    x = 308,697,161.61/18,729.84
  6. Step 6: Final answer
    x = 16,481.57

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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.