Home / 20,989.08-28,965.12-11,557.68

Finding the Fourth Proportional to 20,989.08, 28,965.12 and 11,557.68

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Solution

The fourth proportional to 20,989.08, 28,965.12 and 11,557.68 is: 15,949.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.08 : 28,965.12 = 11,557.68 : x
  2. Step 2: Convert to fraction form
    20,989.08/28,965.12 = 11,557.68/x
  3. Step 3: Cross multiply
    20,989.08x = 28,965.12 × 11,557.68
  4. Step 4: Simplify right side
    20,989.08x = 334,769,588.12
  5. Step 5: Solve for x
    x = 334,769,588.12/20,989.08
  6. Step 6: Final answer
    x = 15,949.70

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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.