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Finding the Fourth Proportional to 7,915.69, 11,868.73 and 5,447.79

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Solution

The fourth proportional to 7,915.69, 11,868.73 and 5,447.79 is: 8,168.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,915.69 : 11,868.73 = 5,447.79 : x
  2. Step 2: Convert to fraction form
    7,915.69/11,868.73 = 5,447.79/x
  3. Step 3: Cross multiply
    7,915.69x = 11,868.73 × 5,447.79
  4. Step 4: Simplify right side
    7,915.69x = 64,658,348.61
  5. Step 5: Solve for x
    x = 64,658,348.61/7,915.69
  6. Step 6: Final answer
    x = 8,168.38

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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.