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Finding the Fourth Proportional to 12,687.76, 17,509.08 and 7,382.89

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Solution

The fourth proportional to 12,687.76, 17,509.08 and 7,382.89 is: 10,188.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,687.76 : 17,509.08 = 7,382.89 : x
  2. Step 2: Convert to fraction form
    12,687.76/17,509.08 = 7,382.89/x
  3. Step 3: Cross multiply
    12,687.76x = 17,509.08 × 7,382.89
  4. Step 4: Simplify right side
    12,687.76x = 129,267,611.64
  5. Step 5: Solve for x
    x = 129,267,611.64/12,687.76
  6. Step 6: Final answer
    x = 10,188.37

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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.