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Finding the Fourth Proportional to 18,511.60, 25,545.80 and 10,128

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Solution

The fourth proportional to 18,511.60, 25,545.80 and 10,128 is: 13,976.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,511.60 : 25,545.80 = 10,128 : x
  2. Step 2: Convert to fraction form
    18,511.60/25,545.80 = 10,128/x
  3. Step 3: Cross multiply
    18,511.60x = 25,545.80 × 10,128
  4. Step 4: Simplify right side
    18,511.60x = 258,727,862.40
  5. Step 5: Solve for x
    x = 258,727,862.40/18,511.60
  6. Step 6: Final answer
    x = 13,976.53

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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.