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Finding the Fourth Proportional to 18,988.52, 28,497.18 and 8,607.40

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Solution

The fourth proportional to 18,988.52, 28,497.18 and 8,607.40 is: 12,917.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,988.52 : 28,497.18 = 8,607.40 : x
  2. Step 2: Convert to fraction form
    18,988.52/28,497.18 = 8,607.40/x
  3. Step 3: Cross multiply
    18,988.52x = 28,497.18 × 8,607.40
  4. Step 4: Simplify right side
    18,988.52x = 245,286,627.13
  5. Step 5: Solve for x
    x = 245,286,627.13/18,988.52
  6. Step 6: Final answer
    x = 12,917.63

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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.