Home / 20,989.23-28,965.06-11,557.78

Finding the Fourth Proportional to 20,989.23, 28,965.06 and 11,557.78

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Solution

The fourth proportional to 20,989.23, 28,965.06 and 11,557.78 is: 15,949.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.23 : 28,965.06 = 11,557.78 : x
  2. Step 2: Convert to fraction form
    20,989.23/28,965.06 = 11,557.78/x
  3. Step 3: Cross multiply
    20,989.23x = 28,965.06 × 11,557.78
  4. Step 4: Simplify right side
    20,989.23x = 334,771,791.17
  5. Step 5: Solve for x
    x = 334,771,791.17/20,989.23
  6. Step 6: Final answer
    x = 15,949.69

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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.