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Finding the Fourth Proportional to 13,398.72, 18,489.95 and 7,430.26

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Solution

The fourth proportional to 13,398.72, 18,489.95 and 7,430.26 is: 10,253.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,398.72 : 18,489.95 = 7,430.26 : x
  2. Step 2: Convert to fraction form
    13,398.72/18,489.95 = 7,430.26/x
  3. Step 3: Cross multiply
    13,398.72x = 18,489.95 × 7,430.26
  4. Step 4: Simplify right side
    13,398.72x = 137,385,042.14
  5. Step 5: Solve for x
    x = 137,385,042.14/13,398.72
  6. Step 6: Final answer
    x = 10,253.60

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