Home / 14,142.80-21,185.40-7,221.20

Finding the Fourth Proportional to 14,142.80, 21,185.40 and 7,221.20

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Solution

The fourth proportional to 14,142.80, 21,185.40 and 7,221.20 is: 10,817.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,142.80 : 21,185.40 = 7,221.20 : x
  2. Step 2: Convert to fraction form
    14,142.80/21,185.40 = 7,221.20/x
  3. Step 3: Cross multiply
    14,142.80x = 21,185.40 × 7,221.20
  4. Step 4: Simplify right side
    14,142.80x = 152,984,010.48
  5. Step 5: Solve for x
    x = 152,984,010.48/14,142.80
  6. Step 6: Final answer
    x = 10,817.09

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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.