Home / 13,989.30-20,984.13-4,128.72

Finding the Fourth Proportional to 13,989.30, 20,984.13 and 4,128.72

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Solution

The fourth proportional to 13,989.30, 20,984.13 and 4,128.72 is: 6,193.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,989.30 : 20,984.13 = 4,128.72 : x
  2. Step 2: Convert to fraction form
    13,989.30/20,984.13 = 4,128.72/x
  3. Step 3: Cross multiply
    13,989.30x = 20,984.13 × 4,128.72
  4. Step 4: Simplify right side
    13,989.30x = 86,637,597.21
  5. Step 5: Solve for x
    x = 86,637,597.21/13,989.30
  6. Step 6: Final answer
    x = 6,193.13

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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.