Home / 20,880.27-28,810.68-12,380.81

Finding the Fourth Proportional to 20,880.27, 28,810.68 and 12,380.81

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Solution

The fourth proportional to 20,880.27, 28,810.68 and 12,380.81 is: 17,083.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.27 : 28,810.68 = 12,380.81 : x
  2. Step 2: Convert to fraction form
    20,880.27/28,810.68 = 12,380.81/x
  3. Step 3: Cross multiply
    20,880.27x = 28,810.68 × 12,380.81
  4. Step 4: Simplify right side
    20,880.27x = 356,699,411.00
  5. Step 5: Solve for x
    x = 356,699,411.00/20,880.27
  6. Step 6: Final answer
    x = 17,083.08

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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.