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Finding the Fourth Proportional to 21,471.76, 29,616.04 and 20,749.24

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Solution

The fourth proportional to 21,471.76, 29,616.04 and 20,749.24 is: 28,619.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,471.76 : 29,616.04 = 20,749.24 : x
  2. Step 2: Convert to fraction form
    21,471.76/29,616.04 = 20,749.24/x
  3. Step 3: Cross multiply
    21,471.76x = 29,616.04 × 20,749.24
  4. Step 4: Simplify right side
    21,471.76x = 614,510,218.06
  5. Step 5: Solve for x
    x = 614,510,218.06/21,471.76
  6. Step 6: Final answer
    x = 28,619.46

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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.