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Finding the Fourth Proportional to 12,720.57, 17,552.75 and 7,055.28

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Solution

The fourth proportional to 12,720.57, 17,552.75 and 7,055.28 is: 9,735.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,720.57 : 17,552.75 = 7,055.28 : x
  2. Step 2: Convert to fraction form
    12,720.57/17,552.75 = 7,055.28/x
  3. Step 3: Cross multiply
    12,720.57x = 17,552.75 × 7,055.28
  4. Step 4: Simplify right side
    12,720.57x = 123,839,530.74
  5. Step 5: Solve for x
    x = 123,839,530.74/12,720.57
  6. Step 6: Final answer
    x = 9,735.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.