Home / 13,920.42-20,880.77-11,143.47

Finding the Fourth Proportional to 13,920.42, 20,880.77 and 11,143.47

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Solution

The fourth proportional to 13,920.42, 20,880.77 and 11,143.47 is: 16,715.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,920.42 : 20,880.77 = 11,143.47 : x
  2. Step 2: Convert to fraction form
    13,920.42/20,880.77 = 11,143.47/x
  3. Step 3: Cross multiply
    13,920.42x = 20,880.77 × 11,143.47
  4. Step 4: Simplify right side
    13,920.42x = 232,684,178.35
  5. Step 5: Solve for x
    x = 232,684,178.35/13,920.42
  6. Step 6: Final answer
    x = 16,715.31

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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.