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Finding the Fourth Proportional to 20,873.79, 28,807.01 and 12,380.94

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Solution

The fourth proportional to 20,873.79, 28,807.01 and 12,380.94 is: 17,086.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,873.79 : 28,807.01 = 12,380.94 : x
  2. Step 2: Convert to fraction form
    20,873.79/28,807.01 = 12,380.94/x
  3. Step 3: Cross multiply
    20,873.79x = 28,807.01 × 12,380.94
  4. Step 4: Simplify right side
    20,873.79x = 356,657,862.39
  5. Step 5: Solve for x
    x = 356,657,862.39/20,873.79
  6. Step 6: Final answer
    x = 17,086.40

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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.