Home / 13,920.63-20,880.53-5,155.35

Finding the Fourth Proportional to 13,920.63, 20,880.53 and 5,155.35

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Solution

The fourth proportional to 13,920.63, 20,880.53 and 5,155.35 is: 7,732.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,920.63 : 20,880.53 = 5,155.35 : x
  2. Step 2: Convert to fraction form
    13,920.63/20,880.53 = 5,155.35/x
  3. Step 3: Cross multiply
    13,920.63x = 20,880.53 × 5,155.35
  4. Step 4: Simplify right side
    13,920.63x = 107,646,440.34
  5. Step 5: Solve for x
    x = 107,646,440.34/13,920.63
  6. Step 6: Final answer
    x = 7,732.87

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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.