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Finding the Fourth Proportional to 20,561.88, 28,345.68 and 13,476

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Solution

The fourth proportional to 20,561.88, 28,345.68 and 13,476 is: 18,577.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,561.88 : 28,345.68 = 13,476 : x
  2. Step 2: Convert to fraction form
    20,561.88/28,345.68 = 13,476/x
  3. Step 3: Cross multiply
    20,561.88x = 28,345.68 × 13,476
  4. Step 4: Simplify right side
    20,561.88x = 381,986,383.68
  5. Step 5: Solve for x
    x = 381,986,383.68/20,561.88
  6. Step 6: Final answer
    x = 18,577.41

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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.