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Finding the Fourth Proportional to 7,889.40, 10,915.02 and 7,716.60

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Solution

The fourth proportional to 7,889.40, 10,915.02 and 7,716.60 is: 10,675.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,889.40 : 10,915.02 = 7,716.60 : x
  2. Step 2: Convert to fraction form
    7,889.40/10,915.02 = 7,716.60/x
  3. Step 3: Cross multiply
    7,889.40x = 10,915.02 × 7,716.60
  4. Step 4: Simplify right side
    7,889.40x = 84,226,843.33
  5. Step 5: Solve for x
    x = 84,226,843.33/7,889.40
  6. Step 6: Final answer
    x = 10,675.95

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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.