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Finding the Fourth Proportional to 18,681.31, 28,022.35 and 7,580.41

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Solution

The fourth proportional to 18,681.31, 28,022.35 and 7,580.41 is: 11,370.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,681.31 : 28,022.35 = 7,580.41 : x
  2. Step 2: Convert to fraction form
    18,681.31/28,022.35 = 7,580.41/x
  3. Step 3: Cross multiply
    18,681.31x = 28,022.35 × 7,580.41
  4. Step 4: Simplify right side
    18,681.31x = 212,420,902.16
  5. Step 5: Solve for x
    x = 212,420,902.16/18,681.31
  6. Step 6: Final answer
    x = 11,370.77

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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.