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Finding the Fourth Proportional to 13,443.60, 18,545.06 and 7,989.58

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Solution

The fourth proportional to 13,443.60, 18,545.06 and 7,989.58 is: 11,021.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,443.60 : 18,545.06 = 7,989.58 : x
  2. Step 2: Convert to fraction form
    13,443.60/18,545.06 = 7,989.58/x
  3. Step 3: Cross multiply
    13,443.60x = 18,545.06 × 7,989.58
  4. Step 4: Simplify right side
    13,443.60x = 148,167,240.47
  5. Step 5: Solve for x
    x = 148,167,240.47/13,443.60
  6. Step 6: Final answer
    x = 11,021.40

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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.