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Finding the Fourth Proportional to 14,220.80, 21,340.80 and 7,980.80

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Solution

The fourth proportional to 14,220.80, 21,340.80 and 7,980.80 is: 11,976.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,220.80 : 21,340.80 = 7,980.80 : x
  2. Step 2: Convert to fraction form
    14,220.80/21,340.80 = 7,980.80/x
  3. Step 3: Cross multiply
    14,220.80x = 21,340.80 × 7,980.80
  4. Step 4: Simplify right side
    14,220.80x = 170,316,656.64
  5. Step 5: Solve for x
    x = 170,316,656.64/14,220.80
  6. Step 6: Final answer
    x = 11,976.59

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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.