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Finding the Fourth Proportional to 69,720.40, 104,580.60 and 17,129.20

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Solution

The fourth proportional to 69,720.40, 104,580.60 and 17,129.20 is: 25,693.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,720.40 : 104,580.60 = 17,129.20 : x
  2. Step 2: Convert to fraction form
    69,720.40/104,580.60 = 17,129.20/x
  3. Step 3: Cross multiply
    69,720.40x = 104,580.60 × 17,129.20
  4. Step 4: Simplify right side
    69,720.40x = 1,791,382,013.52
  5. Step 5: Solve for x
    x = 1,791,382,013.52/69,720.40
  6. Step 6: Final answer
    x = 25,693.80

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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.