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Finding the Fourth Proportional to 7,915.80, 10,920.65 and 7,286.36

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Solution

The fourth proportional to 7,915.80, 10,920.65 and 7,286.36 is: 10,052.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,915.80 : 10,920.65 = 7,286.36 : x
  2. Step 2: Convert to fraction form
    7,915.80/10,920.65 = 7,286.36/x
  3. Step 3: Cross multiply
    7,915.80x = 10,920.65 × 7,286.36
  4. Step 4: Simplify right side
    7,915.80x = 79,571,716.79
  5. Step 5: Solve for x
    x = 79,571,716.79/7,915.80
  6. Step 6: Final answer
    x = 10,052.26

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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.