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Finding the Fourth Proportional to 12,867.12, 17,756.34 and 7,278.12

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Solution

The fourth proportional to 12,867.12, 17,756.34 and 7,278.12 is: 10,043.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,867.12 : 17,756.34 = 7,278.12 : x
  2. Step 2: Convert to fraction form
    12,867.12/17,756.34 = 7,278.12/x
  3. Step 3: Cross multiply
    12,867.12x = 17,756.34 × 7,278.12
  4. Step 4: Simplify right side
    12,867.12x = 129,232,773.28
  5. Step 5: Solve for x
    x = 129,232,773.28/12,867.12
  6. Step 6: Final answer
    x = 10,043.64

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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.