Home / 20,988.72-28,965.60-11,558.16

Finding the Fourth Proportional to 20,988.72, 28,965.60 and 11,558.16

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Solution

The fourth proportional to 20,988.72, 28,965.60 and 11,558.16 is: 15,950.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.72 : 28,965.60 = 11,558.16 : x
  2. Step 2: Convert to fraction form
    20,988.72/28,965.60 = 11,558.16/x
  3. Step 3: Cross multiply
    20,988.72x = 28,965.60 × 11,558.16
  4. Step 4: Simplify right side
    20,988.72x = 334,789,039.30
  5. Step 5: Solve for x
    x = 334,789,039.30/20,988.72
  6. Step 6: Final answer
    x = 15,950.90

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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.