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Finding the Fourth Proportional to 20,646.78, 30,992.01 and 12,860.94

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Solution

The fourth proportional to 20,646.78, 30,992.01 and 12,860.94 is: 19,305.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,646.78 : 30,992.01 = 12,860.94 : x
  2. Step 2: Convert to fraction form
    20,646.78/30,992.01 = 12,860.94/x
  3. Step 3: Cross multiply
    20,646.78x = 30,992.01 × 12,860.94
  4. Step 4: Simplify right side
    20,646.78x = 398,586,381.09
  5. Step 5: Solve for x
    x = 398,586,381.09/20,646.78
  6. Step 6: Final answer
    x = 19,305.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.