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Finding the Fourth Proportional to 7,908.20, 11,915.00 and 7,158.61

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Solution

The fourth proportional to 7,908.20, 11,915.00 and 7,158.61 is: 10,785.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,908.20 : 11,915.00 = 7,158.61 : x
  2. Step 2: Convert to fraction form
    7,908.20/11,915.00 = 7,158.61/x
  3. Step 3: Cross multiply
    7,908.20x = 11,915.00 × 7,158.61
  4. Step 4: Simplify right side
    7,908.20x = 85,294,826.26
  5. Step 5: Solve for x
    x = 85,294,826.26/7,908.20
  6. Step 6: Final answer
    x = 10,785.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.