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Finding the Fourth Proportional to 13,260.80, 19,905.60 and 7,428.80

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Solution

The fourth proportional to 13,260.80, 19,905.60 and 7,428.80 is: 11,151.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,260.80 : 19,905.60 = 7,428.80 : x
  2. Step 2: Convert to fraction form
    13,260.80/19,905.60 = 7,428.80/x
  3. Step 3: Cross multiply
    13,260.80x = 19,905.60 × 7,428.80
  4. Step 4: Simplify right side
    13,260.80x = 147,874,721.28
  5. Step 5: Solve for x
    x = 147,874,721.28/13,260.80
  6. Step 6: Final answer
    x = 11,151.27

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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.