Home / 20,385.08-28,121.06-13,315.64

Finding the Fourth Proportional to 20,385.08, 28,121.06 and 13,315.64

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Solution

The fourth proportional to 20,385.08, 28,121.06 and 13,315.64 is: 18,368.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.08 : 28,121.06 = 13,315.64 : x
  2. Step 2: Convert to fraction form
    20,385.08/28,121.06 = 13,315.64/x
  3. Step 3: Cross multiply
    20,385.08x = 28,121.06 × 13,315.64
  4. Step 4: Simplify right side
    20,385.08x = 374,449,911.38
  5. Step 5: Solve for x
    x = 374,449,911.38/20,385.08
  6. Step 6: Final answer
    x = 18,368.82

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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.