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Finding the Fourth Proportional to 15,868.03, 21,920.22 and 14,687.05

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Solution

The fourth proportional to 15,868.03, 21,920.22 and 14,687.05 is: 20,288.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,868.03 : 21,920.22 = 14,687.05 : x
  2. Step 2: Convert to fraction form
    15,868.03/21,920.22 = 14,687.05/x
  3. Step 3: Cross multiply
    15,868.03x = 21,920.22 × 14,687.05
  4. Step 4: Simplify right side
    15,868.03x = 321,943,367.15
  5. Step 5: Solve for x
    x = 321,943,367.15/15,868.03
  6. Step 6: Final answer
    x = 20,288.81

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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.