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Finding the Fourth Proportional to 18,689, 25,788.30 and 10,729.76

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Solution

The fourth proportional to 18,689, 25,788.30 and 10,729.76 is: 14,805.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689 : 25,788.30 = 10,729.76 : x
  2. Step 2: Convert to fraction form
    18,689/25,788.30 = 10,729.76/x
  3. Step 3: Cross multiply
    18,689x = 25,788.30 × 10,729.76
  4. Step 4: Simplify right side
    18,689x = 276,702,269.81
  5. Step 5: Solve for x
    x = 276,702,269.81/18,689
  6. Step 6: Final answer
    x = 14,805.62

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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.