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Finding the Fourth Proportional to 18,988.49, 28,488.89 and 9,128.54

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Solution

The fourth proportional to 18,988.49, 28,488.89 and 9,128.54 is: 13,695.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,988.49 : 28,488.89 = 9,128.54 : x
  2. Step 2: Convert to fraction form
    18,988.49/28,488.89 = 9,128.54/x
  3. Step 3: Cross multiply
    18,988.49x = 28,488.89 × 9,128.54
  4. Step 4: Simplify right side
    18,988.49x = 260,061,960.17
  5. Step 5: Solve for x
    x = 260,061,960.17/18,988.49
  6. Step 6: Final answer
    x = 13,695.77

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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.