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Finding the Fourth Proportional to 13,458, 18,572.04 and 7,489.20

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Solution

The fourth proportional to 13,458, 18,572.04 and 7,489.20 is: 10,335.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,458 : 18,572.04 = 7,489.20 : x
  2. Step 2: Convert to fraction form
    13,458/18,572.04 = 7,489.20/x
  3. Step 3: Cross multiply
    13,458x = 18,572.04 × 7,489.20
  4. Step 4: Simplify right side
    13,458x = 139,089,721.97
  5. Step 5: Solve for x
    x = 139,089,721.97/13,458
  6. Step 6: Final answer
    x = 10,335.10

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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.