Home / 20,687.88-28,549.34-11,256.45

Finding the Fourth Proportional to 20,687.88, 28,549.34 and 11,256.45

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Solution

The fourth proportional to 20,687.88, 28,549.34 and 11,256.45 is: 15,533.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.88 : 28,549.34 = 11,256.45 : x
  2. Step 2: Convert to fraction form
    20,687.88/28,549.34 = 11,256.45/x
  3. Step 3: Cross multiply
    20,687.88x = 28,549.34 × 11,256.45
  4. Step 4: Simplify right side
    20,687.88x = 321,364,218.24
  5. Step 5: Solve for x
    x = 321,364,218.24/20,687.88
  6. Step 6: Final answer
    x = 15,533.94

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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.