Home / 21,120.38-29,137.84-13,565.67

Finding the Fourth Proportional to 21,120.38, 29,137.84 and 13,565.67

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Solution

The fourth proportional to 21,120.38, 29,137.84 and 13,565.67 is: 18,715.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.38 : 29,137.84 = 13,565.67 : x
  2. Step 2: Convert to fraction form
    21,120.38/29,137.84 = 13,565.67/x
  3. Step 3: Cross multiply
    21,120.38x = 29,137.84 × 13,565.67
  4. Step 4: Simplify right side
    21,120.38x = 395,274,321.95
  5. Step 5: Solve for x
    x = 395,274,321.95/21,120.38
  6. Step 6: Final answer
    x = 18,715.30

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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.