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Finding the Fourth Proportional to 17,817.60, 26,828.80 and 13,721.60

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Solution

The fourth proportional to 17,817.60, 26,828.80 and 13,721.60 is: 20,661.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,817.60 : 26,828.80 = 13,721.60 : x
  2. Step 2: Convert to fraction form
    17,817.60/26,828.80 = 13,721.60/x
  3. Step 3: Cross multiply
    17,817.60x = 26,828.80 × 13,721.60
  4. Step 4: Simplify right side
    17,817.60x = 368,134,062.08
  5. Step 5: Solve for x
    x = 368,134,062.08/17,817.60
  6. Step 6: Final answer
    x = 20,661.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.