Home / 21,009.28-28,991.76-13,557.28

Finding the Fourth Proportional to 21,009.28, 28,991.76 and 13,557.28

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Solution

The fourth proportional to 21,009.28, 28,991.76 and 13,557.28 is: 18,708.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.28 : 28,991.76 = 13,557.28 : x
  2. Step 2: Convert to fraction form
    21,009.28/28,991.76 = 13,557.28/x
  3. Step 3: Cross multiply
    21,009.28x = 28,991.76 × 13,557.28
  4. Step 4: Simplify right side
    21,009.28x = 393,049,408.01
  5. Step 5: Solve for x
    x = 393,049,408.01/21,009.28
  6. Step 6: Final answer
    x = 18,708.37

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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.