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Finding the Fourth Proportional to 18,989.95, 26,189.11 and 15,813.76

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Solution

The fourth proportional to 18,989.95, 26,189.11 and 15,813.76 is: 21,808.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.95 : 26,189.11 = 15,813.76 : x
  2. Step 2: Convert to fraction form
    18,989.95/26,189.11 = 15,813.76/x
  3. Step 3: Cross multiply
    18,989.95x = 26,189.11 × 15,813.76
  4. Step 4: Simplify right side
    18,989.95x = 414,148,300.15
  5. Step 5: Solve for x
    x = 414,148,300.15/18,989.95
  6. Step 6: Final answer
    x = 21,808.81

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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.