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Finding the Fourth Proportional to 21,806.40, 30,093.36 and 11,870.40

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Solution

The fourth proportional to 21,806.40, 30,093.36 and 11,870.40 is: 16,381.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,806.40 : 30,093.36 = 11,870.40 : x
  2. Step 2: Convert to fraction form
    21,806.40/30,093.36 = 11,870.40/x
  3. Step 3: Cross multiply
    21,806.40x = 30,093.36 × 11,870.40
  4. Step 4: Simplify right side
    21,806.40x = 357,220,220.54
  5. Step 5: Solve for x
    x = 357,220,220.54/21,806.40
  6. Step 6: Final answer
    x = 16,381.44

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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.