Home / 20,931.77-28,887.45-11,982.08

Finding the Fourth Proportional to 20,931.77, 28,887.45 and 11,982.08

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Solution

The fourth proportional to 20,931.77, 28,887.45 and 11,982.08 is: 16,536.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.77 : 28,887.45 = 11,982.08 : x
  2. Step 2: Convert to fraction form
    20,931.77/28,887.45 = 11,982.08/x
  3. Step 3: Cross multiply
    20,931.77x = 28,887.45 × 11,982.08
  4. Step 4: Simplify right side
    20,931.77x = 346,131,736.90
  5. Step 5: Solve for x
    x = 346,131,736.90/20,931.77
  6. Step 6: Final answer
    x = 16,536.19

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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.