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Finding the Fourth Proportional to 12,915.30, 17,826.93 and 7,611.84

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Solution

The fourth proportional to 12,915.30, 17,826.93 and 7,611.84 is: 10,506.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,915.30 : 17,826.93 = 7,611.84 : x
  2. Step 2: Convert to fraction form
    12,915.30/17,826.93 = 7,611.84/x
  3. Step 3: Cross multiply
    12,915.30x = 17,826.93 × 7,611.84
  4. Step 4: Simplify right side
    12,915.30x = 135,695,738.85
  5. Step 5: Solve for x
    x = 135,695,738.85/12,915.30
  6. Step 6: Final answer
    x = 10,506.59

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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.