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Finding the Fourth Proportional to 20,871.79, 28,804.25 and 12,378.94

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Solution

The fourth proportional to 20,871.79, 28,804.25 and 12,378.94 is: 17,083.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.79 : 28,804.25 = 12,378.94 : x
  2. Step 2: Convert to fraction form
    20,871.79/28,804.25 = 12,378.94/x
  3. Step 3: Cross multiply
    20,871.79x = 28,804.25 × 12,378.94
  4. Step 4: Simplify right side
    20,871.79x = 356,566,082.50
  5. Step 5: Solve for x
    x = 356,566,082.50/20,871.79
  6. Step 6: Final answer
    x = 17,083.64

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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.