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Finding the Fourth Proportional to 7,687.40, 11,531.10 and 4,231.40

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Solution

The fourth proportional to 7,687.40, 11,531.10 and 4,231.40 is: 6,347.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,687.40 : 11,531.10 = 4,231.40 : x
  2. Step 2: Convert to fraction form
    7,687.40/11,531.10 = 4,231.40/x
  3. Step 3: Cross multiply
    7,687.40x = 11,531.10 × 4,231.40
  4. Step 4: Simplify right side
    7,687.40x = 48,792,696.54
  5. Step 5: Solve for x
    x = 48,792,696.54/7,687.40
  6. Step 6: Final answer
    x = 6,347.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.