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Finding the Fourth Proportional to 13,398.62, 18,489.90 and 7,430.30

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Solution

The fourth proportional to 13,398.62, 18,489.90 and 7,430.30 is: 10,253.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,398.62 : 18,489.90 = 7,430.30 : x
  2. Step 2: Convert to fraction form
    13,398.62/18,489.90 = 7,430.30/x
  3. Step 3: Cross multiply
    13,398.62x = 18,489.90 × 7,430.30
  4. Step 4: Simplify right side
    13,398.62x = 137,385,503.97
  5. Step 5: Solve for x
    x = 137,385,503.97/13,398.62
  6. Step 6: Final answer
    x = 10,253.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.