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Finding the Fourth Proportional to 12,720.58, 17,555.51 and 7,415.28

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Solution

The fourth proportional to 12,720.58, 17,555.51 and 7,415.28 is: 10,233.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,720.58 : 17,555.51 = 7,415.28 : x
  2. Step 2: Convert to fraction form
    12,720.58/17,555.51 = 7,415.28/x
  3. Step 3: Cross multiply
    12,720.58x = 17,555.51 × 7,415.28
  4. Step 4: Simplify right side
    12,720.58x = 130,179,022.19
  5. Step 5: Solve for x
    x = 130,179,022.19/12,720.58
  6. Step 6: Final answer
    x = 10,233.73

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1.5x scale

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.