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Finding the Fourth Proportional to 13,229.79, 18,258.80 and 7,640.79

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Solution

The fourth proportional to 13,229.79, 18,258.80 and 7,640.79 is: 10,545.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,229.79 : 18,258.80 = 7,640.79 : x
  2. Step 2: Convert to fraction form
    13,229.79/18,258.80 = 7,640.79/x
  3. Step 3: Cross multiply
    13,229.79x = 18,258.80 × 7,640.79
  4. Step 4: Simplify right side
    13,229.79x = 139,511,618.25
  5. Step 5: Solve for x
    x = 139,511,618.25/13,229.79
  6. Step 6: Final answer
    x = 10,545.26

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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.