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Finding the Fourth Proportional to 12,128.88, 16,742.26 and 7,655.54

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Solution

The fourth proportional to 12,128.88, 16,742.26 and 7,655.54 is: 10,567.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,128.88 : 16,742.26 = 7,655.54 : x
  2. Step 2: Convert to fraction form
    12,128.88/16,742.26 = 7,655.54/x
  3. Step 3: Cross multiply
    12,128.88x = 16,742.26 × 7,655.54
  4. Step 4: Simplify right side
    12,128.88x = 128,171,041.12
  5. Step 5: Solve for x
    x = 128,171,041.12/12,128.88
  6. Step 6: Final answer
    x = 10,567.43

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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.