Home / 13,979.20-20,972.40-4,118.50

Finding the Fourth Proportional to 13,979.20, 20,972.40 and 4,118.50

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Solution

The fourth proportional to 13,979.20, 20,972.40 and 4,118.50 is: 6,178.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,979.20 : 20,972.40 = 4,118.50 : x
  2. Step 2: Convert to fraction form
    13,979.20/20,972.40 = 4,118.50/x
  3. Step 3: Cross multiply
    13,979.20x = 20,972.40 × 4,118.50
  4. Step 4: Simplify right side
    13,979.20x = 86,374,829.40
  5. Step 5: Solve for x
    x = 86,374,829.40/13,979.20
  6. Step 6: Final answer
    x = 6,178.81

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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.