Home / 20,919.58-28,873.11-12,965.34

Finding the Fourth Proportional to 20,919.58, 28,873.11 and 12,965.34

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Solution

The fourth proportional to 20,919.58, 28,873.11 and 12,965.34 is: 17,894.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.58 : 28,873.11 = 12,965.34 : x
  2. Step 2: Convert to fraction form
    20,919.58/28,873.11 = 12,965.34/x
  3. Step 3: Cross multiply
    20,919.58x = 28,873.11 × 12,965.34
  4. Step 4: Simplify right side
    20,919.58x = 374,349,688.01
  5. Step 5: Solve for x
    x = 374,349,688.01/20,919.58
  6. Step 6: Final answer
    x = 17,894.70

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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.