Home / 20,989.32-28,964.22-11,557.68

Finding the Fourth Proportional to 20,989.32, 28,964.22 and 11,557.68

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Solution

The fourth proportional to 20,989.32, 28,964.22 and 11,557.68 is: 15,949.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.32 : 28,964.22 = 11,557.68 : x
  2. Step 2: Convert to fraction form
    20,989.32/28,964.22 = 11,557.68/x
  3. Step 3: Cross multiply
    20,989.32x = 28,964.22 × 11,557.68
  4. Step 4: Simplify right side
    20,989.32x = 334,759,186.21
  5. Step 5: Solve for x
    x = 334,759,186.21/20,989.32
  6. Step 6: Final answer
    x = 15,949.02

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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.