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Finding the Fourth Proportional to 18,913.22, 28,290.81 and 13,290.48

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Solution

The fourth proportional to 18,913.22, 28,290.81 and 13,290.48 is: 19,880.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,913.22 : 28,290.81 = 13,290.48 : x
  2. Step 2: Convert to fraction form
    18,913.22/28,290.81 = 13,290.48/x
  3. Step 3: Cross multiply
    18,913.22x = 28,290.81 × 13,290.48
  4. Step 4: Simplify right side
    18,913.22x = 375,998,444.49
  5. Step 5: Solve for x
    x = 375,998,444.49/18,913.22
  6. Step 6: Final answer
    x = 19,880.20

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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.